Y. v. Secretary of Health and Human Services ( 2021 )


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  •             In the United States Court of Federal Claims
    No. 17-850V
    (Filed: February 1, 2021)
    (Reissued: March 2, 2021)1
    )
    A.Y., by his parents and natural            )
    guardians,                            )
    J.Y. and S.Y.                               )
    )
    Petitioners,               )
    )
    v.                                 )
    )
    SECRETARY OF HEALTH &                       )
    HUMAN SERVICES,                             )
    )
    Respondent.                )
    )
    Renee J. Gentry, Vaccine Injury Litigation Clinic, George Washington University Law
    School, Washington, D.C., for Petitioner.
    Jeremy Fugate, United States Department of Justice, Civil Division, Washington, D.C., for
    Respondent. On the brief were Ethan P. Davis, Acting Assistant Attorney General, Civil
    Division, C. Salvatore D’Alessio, Acting Director, Catherine E. Reeves, Deputy Director,
    and Jennifer L. Reynaud, Torts Branch, Civil Division, United States Department of
    Justice, Washington, D.C.
    OPINION AND ORDER
    SOLOMSON, Judge.
    On June 22, 2017, Petitioners, [* * *], filed a petition for compensation on behalf
    of their minor son, A.Y, pursuant to the National Childhood Vaccine Injury Act of 1986
    1On February 1, 2021, the Court issued under seal an unredacted version of this opinion and
    order in accordance with Rule 18(b) of the Vaccine Rules (Appendix B) of the Court of Federal
    Claims. The Court provided the parties with 14 days to propose redactions. On February 16,
    2021, Petitioners filed proposed redactions, ECF No. 60–1, to which the government did not file
    an objection. The Courts adopts Petitioners’ proposed redactions and accordingly reissues this
    public version of this opinion and order.
    (the “Vaccine Act”), 42 U.S.C. §§ 300aa-1 et seq. Petitioners alleged that A.Y.
    experienced a skin rash in 2014 or 2015 because of a varicella vaccine that he received,
    seven-years earlier, on November 15, 2007. Chief Special Master Corcoran denied the
    petition, concluding that Petitioners failed to prove by a preponderance of the evidence
    that: (1) A.Y. actually experienced a reactivation of varicella; (2) varicella could
    reactivate seven years after vaccination; and (3) given A.Y.’s complicated medical
    history, that the varicella vaccine caused the alleged post-reactivation symptoms. A.Y.
    v. Sec’y of Health & Human Servs., 
    2020 WL 5351342
    , *1 (Fed. Cl. Spec. Mstr. June 26,
    2020) (ECF No. 45). Petitioners seek review of Chief Special Master Corcoran’s decision,
    arguing that he abused his discretion in reaching these factual conclusions, that he
    utilized medical research from outside the pleadings, and improperly declined to credit
    the opinion of Petitioners’ expert witness. Respondent, the United States, counters that
    Chief Special Master Corcoran provided a reasonable explanation for his decision and
    that, in accordance with the highly deferential standard of review applicable to this
    case, this Court should not second-guess that reasoned decision.
    For the reasons explained below, the Court denies Petitioners’ motion for review
    and sustains the Chief Special Master’s denial of Petitioners’ claim for compensation.
    I.      Factual And Procedural Background2
    A.      A.Y.’s Medical History
    On November 14, 2006, A.Y., the eldest of triplets, was born prematurely. A.Y.,
    
    2020 WL 5351342
     at *2. He spent the subsequent month in the hospital’s neonatal
    intensive care unit. 
    Id.
     During that time, he was treated for reflux. 
    Id.
     In November
    2007, when A.Y. was one-year old, he received the varicella vaccine. 
    Id.
     He did not
    experience any immediate symptoms as a result of vaccination. 
    Id.
    Shortly thereafter, [* * *] became concerned that A.Y. was experiencing
    developmental delays. 
    Id.
     Beginning in December 2007, A.Y. started receiving speech
    and occupational therapy through early childhood intervention services; on June 25,
    2008, A.Y. was further evaluated for developmental delays at the Helping Hands Clinic
    in San Antonio, Texas. 
    Id.
     During this time, the [* * *] also became concerned with
    A.Y.’s gastrointestinal health. 
    Id.
     A.Y.’s pediatrician noted that A.Y. was eating certain
    solids, but had difficulty with yogurt, cheese, or meat. 
    Id.
     In 2009, A.Y. was evaluated
    2For the purpose of resolving the pending motion for review, the Court summarizes the facts as
    presented in the Chief Special Master’s decision and does not make independent findings of
    fact. See, infra, Section II; see also Pafford v. Sec’y of Health & Human Servs., 
    64 Fed. Cl. 19
    , 22 n.4
    (2005), aff’d, 
    451 F.3d 1352
     (Fed. Cir. 2006).
    -2-
    by Dr. Ricki G. Robinson, a clinical pediatric professor, at Descanso Medical Center for
    Development and Learning in LeCanada, California, who documented A.Y.’s eating
    difficulties. 
    Id.
     A.Y. tested negative for celiac disease and his antibody levels were
    found to be within the normal range. 
    Id.
    In November 2009, after A.Y. turned three-years old, he was formally diagnosed
    with autism. A.Y., 
    2020 WL 5351342
     at *2. In light of this diagnosis and his persistent
    gastrointestinal issues, the [* * *] took A.Y. to Dr. Jerrold Kartzinel at the Kartzinel
    Wellness Center in Orlando, Florida for further observations. 
    Id.
     In a July 2010 “to
    whom it may concern” letter, Dr. Kartzinel asserted that “A.Y. had been diagnosed with
    epilepsy, gastroesophageal reflux, encephalopathy, metabolism disorder, sleep
    disorder, immune mechanism disorder, and abnormal feces.” Id. at *3. Dr. Kartzinel
    also recommended a specific diet for A.Y. Id.
    Over the ensuing four years (from 2010 until 2014), “A.Y. received a dizzying
    number of treatments and medications.” Id. A.Y. was administered a “‘mito cocktail’ of
    supplements to treat a purported mitochondrial/energy processing disorder” and was
    prescribed numerous medications, including:
    (a) three 90-day courses of Acyclovir/Valtrex (an antiviral
    drug used primarily for treatment of herpes and chickenpox);
    (b) antibiotics and antifungal medication for “mouthing”;
    (c) leucovorin/folinic acid, most commonly used to treat
    chemotherapy side effects or folate deficiencies;
    (d) Gabapentin/Neurontin (nerve pain medication and
    anticonversant);
    (e) an attention-deficit/hyperactivity disorder medication;
    and
    (f) a medication used to treat dementia and Alzheimer's
    disease.
    Id. (internal citations omitted). Additionally, “A.Y. received hyperbaric oxygen therapy,
    a questionably-effective therapy often employed in the treatment of autism[, a]nd in the
    late fall of 2013, A.Y. received stem cell therapy as well.” Id. (internal citations omitted).
    In September 2013, A.Y. was diagnosed with a “cycle of abdominal pain” that
    “continued off and on, varying in [its] severity.” Id. To treat his abdominal issues, in
    late 2014, A.Y. received immunoglobulin and steroidal treatments, in addition to stem
    cell treatments. Id.
    -3-
    In January 2015, A.Y., now eight-years old, “developed a rash, starting on his
    neck and spreading throughout his body.” A.Y., 
    2020 WL 5351342
     at *4. A.Y.’s
    pediatrician diagnosed the rash as “possible atypical varicella” and prescribed Acyclovir
    (the same anti-viral medication that A.Y. had received years earlier). 
    Id.
     (emphasis
    added). The rash “almost cleared up” within a few days; A.Y.’s pediatrician did not
    conduct testing to confirm the varicella diagnosis. 
    Id.
     On January 8, 2015, in an on-line
    discussion with Dr. Kartzinel, the [* * *] reported that the rash “[n]ever caused itching
    or discomfort.” 
    Id.
    In November 2015, the [* * *] consulted with Dr. Kartzinel again, at which time
    they discussed A.Y.’s stomach pains and “the beginnings of a chick[en] pox type rash.”
    
    Id.
     That same month, Dr. Arthur Krigsman, a gastroenterologist, examined A.Y. as part
    of a pre-endoscopy and colonoscopy physical. Id. at *5. At this time, the [* * *]
    claimed that A.Y. had experienced five episodes of “chickenpox lesions” over the past
    eleventh months but had been successfully treated with Acyclovir. Id. Following A.Y.’s
    endoscopy and colonoscopy, Dr. Krigsman diagnosed him with autism spectrum
    disorder-associated enteritis. Id. Subsequently, Dr. Anne Gershon, a researcher and
    professor at Columbia University College of Physicians and Surgeons, reviewed the
    biopsy results from the endoscopy and colonoscopy. Id. Dr. Gershon informed
    Dr. Krigsman that she “found RNA transcripts of 3 [varicella] genes . . . in the intestinal
    specimens.” Id. (bracketed alteration in original). Dr. Gershon advised the [* * *] that
    A.Y. should take Valacyclovir for his stomach pains and that he should see Dr. Raffi
    Tachdjian, an allergist and immunologist. Id.
    In December 2015, Dr. Tachdjian evaluated A.Y. Id. Dr. Tachdjian found that
    A.Y.’s medical history was not entirely consistent with a reactivation of a varicella
    infection. Id. Specifically, he noted that photos of A.Y.’s rash was “not that of classic
    varicella” and that A.Y. previously had tested negative for antibodies. Id. To help with
    A.Y.’s “poor antibody function,” Dr. Tachdjian prescribed IVIG therapy. Id. On
    February 3, 2016, A.Y. was seen by Dr. Paul Krogstad, a pediatric disease specialist, who
    opined that while the rashes were “compatible with varicella,” because they quickly
    cleared up after being treated with Acyclovir, other possible causes, such as viral
    exanthemas or enterovirus infections, should be considered. Id. at *6. In an August
    2016 letter, Dr. Tachdjian reiterated his belief that the cause of A.Y.’s rash was still
    undetermined but noted that a saliva test performed on A.Y. in February 2016 that
    tested positive for varicella appeared to corroborate Dr. Gershon’s findings that A.Y.
    suffered from a “recurrent Varicella infection.” Id. at *5.
    -4-
    B.      Procedural History
    1. The [* * *] File A Petition For Compensation
    On June 22, 2017, the [* * *] filed a petition for compensation pursuant to the
    Vaccine Act. ECF No. 1. On November 7, 2017, Petitioners filed portions of A.Y.’s
    relevant medical records but did not complete these records until August 2018.3 ECF
    Nos. 7, 8, 26. The [* * *] alleged that A.Y. developed a varicella skin rash in 2014 or
    2015 as a result of a varicella vaccine that he received on November 15, 2007. A.Y., 
    2020 WL 5351342
     at *9. They also alleged that, because of the reactivation of varicella, A.Y.
    suffered a significant aggravation of his preexisting abdominal and behavioral issues.
    
    Id.
     On November 15, 2018, the government filed its report, recommending denying the
    petition. ECF No. 29. Given the novelty of the [* * *]’ claim that varicella vaccine
    could reactivate seven-years later, Chief Special Master Corcoran ordered additional
    briefing on that issue and the parties filed timely responses. ECF Nos. 38, 41, 44.
    2. Expert Testimony
    On March 28, 2019, the [* * *], in support of their contentions, presented expert
    opinion testimony from three doctors: Dr. Robinson, Dr. Richard A. Honaker, and
    Dr. Gershon. ECF No. 34; see A.Y., 
    2020 WL 5351342
     at *6. Dr. Robinson submitted a
    three-page report that largely summarized A.Y.’s medical history based on her personal
    knowledge of his autism-related developmental challenges. 
    Id.
     While Dr. Robinson
    assumed that A.Y.’s worsening behavioral changes were caused by the varicella
    reactivation, she did not purport to have “direct knowledge pertaining to how a vaccine
    might result in viral reactivation.” 
    Id.
     (emphasis in original). Instead, Dr. Robinson’s
    opinion relied entirely upon Dr. Gershon’s opinion that the November 2015 biopsy
    revealed the same varicella strain as contained in the vaccine that A.Y. received seven-
    years earlier. 
    Id.
    Dr. Honaker, who had never treated A.Y. and only reviewed his medical records,
    likewise was only able offer a medical chronology but could not directly testify as to the
    likelihood of A.Y. having experienced a varicella reactivation from the vaccine. Id. at *7.
    He admitted that “he lacks specialization in the medical or scientific areas put into
    dispute in this case” and recommended “contacting other professionals to conduct a
    multidisciplinary interaction amongst them to ascertain the issues in this case.” Id.
    (internal citations omitted). As part of his report, Dr. Honaker attached an article co-
    3Because of deficiencies with these filings, A.Y.’s medical records were refiled on February 20,
    2019. ECF Nos 32, 33. Chief Special Master Corcoran noted that even after refiling, it was
    “impossible to conclude that the records are now complete.” A.Y., 
    2020 WL 5351342
     at *1 n.4.
    -5-
    authored by Dr. Gershon, Varicella-Zoster Virus and the Enteric Nervous System, 218 J.
    Infect. Diseases, Supp. 2, S113-19 (Nov. 2018) (the “Gershon Article”), relevant to her
    opinion of varicella reactivation. A.Y., 
    2020 WL 5351342
     at *7–*8. The Gershon Article
    primarily focused on the latency of the varicella virus but also mentioned “that
    vaccination has been found to be capable of latency and reactivation.” Id. at *8. Chief
    Special Master Corcoran noted that the medical articles cited in the Gershon Article for
    the proposition that varicella vaccine is capable of latency and reactivation were not
    filed as part of the record. Id.
    Dr. Gershon offered her expert opinion based on having “researched [Varicella
    Zoster Virus], Zoster, and latency and reactivation throughout her career.” Id. at *7. In
    her opinion, “it is medically understood that the wild varicella virus can stay latent for
    long periods of time . . . but can then be reactivated to cause infection.” Id. at *8.
    Dr. Gershon presumed that, by extension, the live viral components of the varicella
    vaccine could act in the same manner. Id. Dr. Gershon further reported that after
    reviewing A.Y.’s 2015 biopsy, she found that he “was experiencing an ‘active’ varicella
    infection” and that this conclusion was further bolstered by a 2016 saliva test, at which
    time A.Y. tested positive for varicella. Id. Chief Special Master Corcoran noted that that
    record did not contain a contemporaneous report from Dr. Gershon regarding her
    analysis of the 2015 biopsy; rather, Dr. Gershon had submitted a one-page report dated
    November 9, 2017, in which she documented her findings from two years earlier. Id.
    Chief Special Master Corcoran further noted that “[n]o backup materials relating to this
    [2015] testing” or any evidence of the 2016 saliva tests was submitted for the record. Id.
    3. The Chief Special Master’s Decision
    On June 26, 2020, Chief Special Master Corcoran rendered his decision, denying
    entitlement for compensation. A.Y., 
    2020 WL 5351342
     at *1. Chief Special
    Master Corcoran found that, as an initial matter, the [* * *] failed to establish by a
    preponderance of evidence that A.Y. suffered a varicella-type rash in 2015. A.Y., 
    2020 WL 5351342
     at *20. Moreover, Chief Special Master Corcoran determined that the [* *
    *]’ timeframe argument – that there could exist a seven-year gap between the alleged
    onset of varicella and A.Y. receiving the vaccine – was not medically accepted. Id. at
    *21. Chief Special Master Corcoran noted that the expert opinions of Drs. Robinson and
    Honaker did not go to the issue of causation. Id. at *24. While he acknowledged
    Dr. Gershon’s expert opinion in this matter, Chief Special Master Corcoran ultimately
    determined that her report based on the 2015 biopsy findings “suffer[s] from reliability
    concerns” and that her theory of varicella vaccine reactivation was unproven, at least as
    applied to the facts of this case involving a seven-year gap between vaccination and
    reactivation. Id. at *20–*21, *24. He also found that the “dizzying plethora of
    treatments” that A.Y. received for his “autism-related developmental problems and
    -6-
    gastrointestinal symptoms” during that seven-year span reasonably could have served
    as intervening causes for the varicella-like rash. A.Y., 
    2020 WL 5351342
     at *22.
    Finally, Chief Special Master Corcoran concluded that the [* * *] failed to
    establish, by preponderant evidence, their significant aggravation claim that the
    varicella vaccine reactivation impacted A.Y.’s preexisting gastrointestinal and
    behavioral issues. Id. at *22. Chief Special Master Corcoran reasoned that the record
    evidence supported that A.Y. experienced serious behavioral and gastrointestinal issues
    before the purported 2015 reactivation and that the [* * *] thus had failed to
    demonstrate that A.Y.’s alleged worsening symptoms were attributable to a reactivation
    of varicella. Chief Special Master Corcoran also opined that the alleged aggravation of
    A.Y.’s symptoms could just as likely be attributable to the treatments for “A.Y.’s autism
    and other conditions that certain of their treaters, like Dr. Krigsman have associated
    with [autism].” Id. at *22–*23.
    4. Petitioners File A Motion For Review
    On July 27, 2020, Petitioners filed a motion for review of the Chief Special
    Master’s decision pursuant to Rule 23 of the Court of Federal Claims, Appendix B
    (“Vaccine Rules”). ECF No. 48 (“Pet. Mot.”) at 1. In seeking such review, Petitioners
    argue that the Chief Special Master: (1) abused his discretion by misconstruing A.Y.’s
    claim as arising from autism instead of a “varicella reactivation causing a varicella-like
    rash”; (2) abused his discretion by relying on scientific and medical literature that
    Petitioners did not introduce into the record; and (3) incorrectly required A.Y. to prove
    his injury by “direct evidence” rather than a “preponderance of the evidence” standard
    as required by Althen v. Sec’y of Health & Human Servs., 
    418 F.3d 1274
     (Fed. Cir. 2005).
    Pet. Mot. at 3. Accordingly, Petitioners ask this Court to reverse the Chief Special
    Master’s decision regarding their varicella reactivation claim, or, in the alternative,
    remand the case for further consideration. Id. at 2. Petitioners did not seek review of
    the denial of their significant aggravation claim.
    On August 26, 2020, the government filed its response to Petitioners’ motion for
    review. ECF No. 51 (“Resp. Br.”) at 1. On November 12, 2020, the Court held oral
    argument. ECF No. 54.
    II.    Jurisdiction And Standard Of Review
    This Court possesses jurisdiction, pursuant to the Vaccine Act, to review a special
    master’s decision upon the filing of a petition from the unsuccessful party within thirty
    days of that decision. 42 U.S.C. § 300aa-12(e)(1). The Court may: “(A) uphold the finds
    of fact and conclusions of the special master . . ., (B) set aside the findings of fact or
    -7-
    conclusions of law . . ., or (C) remand the petition to the special master for further action
    in accordance with the court’s direction.” Id. § 300aa-12(e)(2). Legal conclusions are
    reviewed de novo, whereas discretionary decisions are reviewed for abuse of discretion.
    Munn v. Sec’y of Health & Human Servs., 
    970 F.2d 863
    , 870 n.10 (Fed. Cir. 1992). The
    special master’s factual findings are reviewed under the highly deferential “arbitrary
    and capricious” standard. Lombardi v. Sec’y of Health & Human Servs., 
    656 F.3d 1343
    ,
    1350 (Fed. Cir. 2011); Tullio v. Sec’y of Health & Human Servs., 
    149 Fed. Cl. 448
    , 456 (2020)
    (“The arbitrary and capricious standard is well understood to be the most deferential
    possible.” (internal quotation marks omitted)).
    III.   Petitioners’ Motion For Review
    The Vaccine Act provides a framework permitting petitioners to seek
    compensation for a vaccine-related “illness, disability, injury, or condition” that lasts
    “more than 6 months.” 42 U.S.C. §§ 300aa-11(c)(1)(C), (c)(1)(D)(i); see Broekelschen v.
    Sec’y of Health & Human Servs., 
    618 F.3d 1339
    , 1346 (Fed. Cir. 2010) (“identifying the
    injury is a prerequisite to the [causation] analysis”). For vaccines administered after
    October 1, 1988, petitions must be filed within “36 months after the date of the
    occurrence of the first symptom . . . of such injury.” 42 U.S.C. § 300aa-16(a)(2). For
    injuries not already recognized by the Vaccine Injury Table, see id. § 300aa-14, such as
    the case at issue here, “the petitioner must prove actual causation by a preponderance
    of the evidence.” W.C. v. Sec’y of Health & Human Servs., 
    704 F.3d 1352
    , 1356 (Fed. Cir.
    2013); see Moberly v. Sec’y of Health & Human Servs., 
    592 F.3d 1315
    , 1322 (Fed. Cir. 2010)
    (holding that “preponderant evidence” necessitates more than a “’plausible’ or
    ‘possible’ causal link between the vaccine and the injury”). To prove causation in fact,
    the petitioner must provide: “(1) a medical theory casually connecting the vaccination
    and the injury; (2) a logical sequence of cause and effect showing that the vaccination
    was the reason for the injury; and (3) a showing of proximate temporal relationship
    between vaccination and injury.” Althen v. Sec’y of Health & Human Servs., 
    418 F.3d 1274
    , 1278 (Fed. Cir. 2005). The third Althen prong requires “preponderant proof that
    the onset of symptoms occurred within a framework for which, given the medical
    understanding of the disorder’s etiology, it is medically acceptable to infer causation-in-
    fact.” de Bazan v. Sec’y of Health & Human Servs., 
    539 F.3d 1347
    , 1352 (Fed. Cir. 2008)
    (emphasis added); see Veryzer v. Sec’y of Health & Human Servs., 
    100 Fed. Cl. 344
    , 356
    (2011) (“Merely showing that injury occurred after the administration of a vaccine is
    insufficient.”).
    The [* * *] argue that the Chief Special Master overemphasized A.Y.’s
    preexisting autism diagnosis when evaluating the varicella vaccine claim. Pet. Mot. at
    13–16. Furthermore, the [* * *] contend that the Chief Special Master improperly
    relied on medical literature and reports not contained in the record, and which the [* *
    -8-
    *] argue they did not have an opportunity to address. 
    Id.
     at 16–18. Finally, the [* * *]
    assert that the Chief Special Master improperly discredited Dr. Gerson’s expert
    testimony. 
    Id.
     18–19. While the Court sympathizes deeply with the [* * *] regarding
    A.Y.’s numerous medical issues, the Court finds that the Chief Special Master’s decision
    was not arbitrary, capricious, or an abuse of discretion, and, accordingly, the Court
    sustains his decision for the reasons explained below.
    A.     The Chief Special Master Did Not Act Arbitrarily By Referencing
    A.Y.’s Autism Diagnosis
    The [* * *] argue that the Chief Special Master abused his discretion, as “his
    entire review of the medical records in this case cast it almost exclusively as an autism
    case, i.e. that Petitioners are alleging A.Y.’s autism was caused by his vaccinations.”
    Pet. Mot. at 15. The [* * *] note that the Chief Special Master used the terms “autism”
    and “autism spectrum disorder” a combined 41 times in the decision, that he “is highly
    critical of two of A.Y.’s treating doctors . . . as they pertain to autism,” and that the Chief
    Special Master made “several negative statements about the treatments [they] sought
    for him – for his autism.” 
    Id.
     at 13–15 (emphasis in original). In their view, this
    demonstrates that autism “was the lens through which [the Chief Special Master]
    viewed the evidence.” Id. at 16.
    Although the [* * *] invoke the “abuse of discretion” standard, that standard is
    limited to discretionary decisions and “rarely come[s] into play.” Munn, 
    970 F.2d at
    870
    n.10 (holding that exclusion of evidence is subject to abuse of discretion standard); see
    also Harding v. Sec’y of Health & Human Servs., 
    146 Fed. Cl. 381
    , 393–94 (2019)
    (“contesting a special master’s determination of reasonable attorney’s fees, the
    applicable standard of review is abuse of discretion”). Because the [* * *] in essence
    contest the Chief Special Master’s findings of fact, this Court properly evaluates his
    weighing of the evidence and resulting factual conclusions pursuant to the “arbitrary
    and capricious” standard of review. See Munn, 
    970 F.2d at
    870 n.10.
    Accordingly, on a motion to review, this Court “do[es] not reweigh the factual
    evidence, assess whether the special master correctly evaluated the evidence, or
    examine the probative value of the evidence or credibility of the witnesses–these are all
    matters within the purview of the fact finder.” Porter v. Sec’y of Health & Human Servs.,
    
    663 F.3d 1242
    , 1249 (Fed. Cir. 2011); see Cedillo v. Sec’y of Health & Human Servs., 
    617 F.3d 1328
    , 1338 (Fed. Cir. 2010) (“Our role is not to second guess the Special Master’s fact-
    intensive conclusions[.]” (brackets and quotation marks omitted)). Because “the special
    masters have broad discretion to weigh evidence and make factual determinations,”
    Dougherty v. Sec’y of Health & Human Servs., 
    141 Fed. Cl. 223
    , 229 (2018), “reversible error
    will be extremely difficult to demonstrate.” Hibbard v. Sec’y of Health & Human Servs.,
    -9-
    
    698 F.3d 1355
    , 1363 (Fed. Cir. 2012). In sum, “if the special master’s conclusion is based
    on evidence in the record that is not wholly implausible, [this Court is] compelled to
    uphold that finding as not being arbitrary and capricious.” Deribeaux v. Sec’y of Health &
    Human Servs., 
    717 F.3d 1363
    , 1367 (Fed. Cir. 2013) (brackets and quotation marks
    omitted).
    The Court does not deny that the Chief Special Master continuously references
    A.Y.’s autism throughout his decision. And, indeed, the Court concurs with Petitioners
    that the case law does not “support the denial of a petitioners [sic] claim on the basis of
    preexisting autism.” Pet. Mot. at 16. That is, of course, where a petitioner’s claim does
    not involve an allegation that a vaccine precipitated autism. See, e.g., Yates v. Sec’y of
    Health & Human Servs., 
    150 Fed. Cl. 575
    , 577–78 (2020) (reviewing petition of individual
    with “a history of autism” for injuries allegedly caused after receiving the Menactra
    vaccine); Spahn v. Sec’y of Health & Human Servs., 133 Fed Cl. 588, 591–92 (2017)
    (reviewing petition of individual, who was diagnosed with autism, claiming that
    tetanus-diphtheria vaccine significantly aggravated obsessive-compulsive disorder). In
    this case, however, the [* * *] asserted two claims for compensation based on the
    alleged reactivation of the varicella vaccine: (1) A.Y.’s alleged varicella skin rash, and
    (2) significant aggravation of A.Y.’s autism-related behavioral and intestinal issues. See A.Y.,
    
    2020 WL 5351342
     at *1. Thus, to be fair, the [* * *] themselves placed A.Y.’s autism at
    the center of their petition for compensation. The Chief Special Master was, in turn,
    required to evaluate the onset and severity of A.Y.’s autism-related issues in
    determining the legitimacy of the significant aggravation claim. Once the [* * *]
    submitted related medical records and supporting materials into the record, it is
    unsurprising (if not required) that the Chief Special Master also considered whether the
    myriad of autism treatments provided a possible alternative explanation for the alleged
    skin rash or exacerbated behavioral and other symptoms.
    Arguing that the Chief Special Master mischaracterized Dr. Gershon’s expert
    opinion, the [* * *] are highly critical of the Chief Special Master’s observation that
    “[t]he causation theory in this case has numerous ‘echoes’ with such previously-litigated
    [autism] claims.” Pet Mot. at 16 (emphasis added) (quoting A.Y., 
    2020 WL 5351342
     at
    *24 n.34). And, when read in a vacuum, that comment certainly appears to be
    supportive of the [* * *]’ argument. A closer examination of the Chief Special Master’s
    decision, however, demonstrates that he appropriately qualified his observation, as
    follows:
    My determination not to hold a hearing was also influenced
    in minor part by the undeniable fact that this case presents
    circumstances common to many other ASD injury cases
    previously litigated in the Program, in which well meaning
    - 10 -
    parents pursue questionable medical treatments that may
    themselves have unpredictable complications, while also insisting
    that vaccination played some role in the child's condition. . . . The
    causation theory in this case has numerous “echoes” with
    such previously-litigated claims—in particular to the extent it
    sought to establish that certain aspects of A.Y.’s ASD-related
    behaviors were worsened by the purported varicella reactivation—
    and those parallels underscored for me why resolution on the
    papers was preferable to hearing.
    A.Y., 
    2020 WL 5351342
     at *24 n.34 (emphasis added) (internal citation omitted). The
    “echoes” that the Chief Special Master referenced were the [* * *]’ significant
    aggravation claim of A.Y.’s preexisting behavioral issues and the myriad of
    controversial treatments that A.Y. received during the seven years in between
    vaccination and the alleged reactivation. Additionally, the Chief Special Master does
    not appear to have relied on similarities between the present case and previous autism
    cases to deny the [* * *]’ petition; rather his observation was made merely in the
    context of deciding that a hearing was unnecessary. In sum, the Chief Special Master
    did not act arbitrarily in weighing all of the autism-related medical information that
    was provided by the [* * *].
    B.     The Chief Special Master Did Not Commit Reversable Error By
    Consulting Medical Literature Outside Of The Pleadings
    The [* * *] next contend that the Chief Special Master abused his discretion by
    improperly consulting medical literature, websites, and reports not submitted by
    Petitioners or the government. Pet. Mot. at 16–18. The [* * *] assert that due process
    considerations required the Chief Special Master to have provided the [* * *] with a
    meaningful opportunity to examine and address all materials that he relied upon in
    reaching his decision to deny A.Y. compensation. 
    Id.
     The [* * *] maintain that they
    were not provided with such an opportunity, and, thus, that the Chief Special Master’s
    decision should be reversed. 
    Id.
    Our appellate court, the United States Court for the Federal Circuit, has held that
    “[i]t is axiomatic that special masters in vaccine cases have great leeway in building a
    record for decision.” Davis v. Sec’y of Health & Human Servs., 
    94 Fed. Cl. 53
    , 65 (2010),
    aff’d, 420 F. App’x 973 (Fed. Cir. 2011). In admitting evidence for the record, special
    masters are provided “flexible and informal standards,” 42 U.S.C. § 300aa-12(d)(2)(B),
    and are “not . . . bound by common law or statutory rules of evidence.” Vaccine Rule
    8(b)(1). This flexibility must be balanced with the directive that “core concepts of due
    process apply to proceedings before a special master.” Davis, 94 Fed. Cl. at 65. In that
    - 11 -
    regard, a special master is required to “provide adequate notice to the parties of
    evidentiary issues” and “to decide [the case] on the record.” Id. (citing 42 U.S.C. §§
    300aa-12(d)(3)(B)(iv),(v), and 300aa-13(a)(1)); see Campbell v. Sec’y of Health & Human
    Servs., 
    69 Fed. Cl. 775
    , 778 (2006) (“Moreover, consistent with due process, this fairness
    surely entails notice and an effective opportunity to be heard at a meaningful time and
    in a meaningful manner.”).
    Within this framework, the Federal Circuit has recognized that it may be
    appropriate for special masters to take judicial notice of certain facts without notifying
    the parties. Hines v. Sec’y of Health & Human Servs., 
    940 F.2d 1518
    , 1526 (Fed. Cir. 1991);
    see Rodriguez v. Sec’y of Health & Human Servs., 
    91 Fed. Cl. 453
    , 460 (2010) (“the [Federal
    Circuit] has approved the taking of judicial notice in a case arising under the Vaccine
    Act”). Judicial notice of facts that are “not subject to reasonable dispute” from “sources
    whose accuracy cannot reasonably be questioned,” does not violate due process, the
    Federal Circuit reasoned, because the party still has the opportunity to challenge any
    prejudice arising from that information on review before the Court of Federal Claims.
    Hines, 
    940 F.2d at 1526
    . Indeed, the Federal Circuit noted that “[w]ell-known medical
    facts are the types of matters which judicial notice may be taken.” 
    Id.
    In his decision, the Chief Special Master cited seven sources that were not
    presented by the parties. See A.Y., 
    2020 WL 5351342
     at *17–*18, *21, *21 n.29.
    Specifically, in the section of his decision entitled “Varicella Reactivation and Relevant
    Varicella Vaccine Cases,” the Chief Special Master considered two medical textbooks –
    Atlas of Pediatric Physical Diagnosis 444 (5th ed. 2007) and Nelson Textbook of
    Pediatrics 1579–84 (R. Kliegman et al., 20th ed. 2016) – to establish generally accepted
    propositions about the varicella virus, including its symptoms, potential for latency and
    reactivation, and common treatments. Id. at *17. Because this information was sourced
    in two medical textbooks, “both are within the bounds of judicial notice as they contain
    commonly known information which need not be proved.” Griffin v. Sec’y of Health &
    Human Servs., 
    124 Fed. Cl. 101
    , 107 (2014) (citing B.V.D. Licensing Corp. v. Body Action
    Design, 
    846 F.2d 727
    , 728 (Fed. Cir. 1988)).
    The Chief Special Master also cited three websites not presented by the parties.
    A.Y., 
    2020 WL 5351342
     at *18, *21. One such website was a government website – the
    Federal Drug Administration website. Id. at *21. The Chief Special Master consulted
    that website for generally available information about the viral contents of the varicella
    vaccine (known as varivax). Id. The other two websites were the Mayo Clinic website
    and an online microbiology journal available on a website associated with the National
    Institutes of Health. Id. at *18. As with the medical dictionaries, the Chief Special
    Master utilized these online sources to further explain the ability of the varicella virus to
    remain latent and reactivate after lengthy periods of inactivity. Id. Again, because the
    - 12 -
    accuracy of this information available through these reputable sources is not seriously
    subject to debate, the Chief Special Master did not err in taking judicial notice of their
    contents.4 See Griffin, 124 Fed. Cl. at 107.
    More significantly, in the [* * *]’ motion for review – other than asserting that
    they were not afforded an opportunity to examine these medical textbooks and online
    materials before the Chief Special Master rendered his decision – the [* * *] fail to
    explain (or even allege) precisely how they were prejudiced by the Chief Special
    Master’s consideration of these materials.5 See Pet. Mot. at 16–18. On the contrary, as
    the government correctly notes in its response, these materials were at least partially “to
    the advantage of petitioners” in that they provided some factual support about the
    latency and reactivation capabilities of the varicella virus. Resp. Br. at 11.
    Finally, the Chief Special Master considered two of the references footnoted by
    the Gershon Article, which the [* * *] submitted for the record as part of
    Dr. Honaker’s expert opinion. A.Y., 
    2020 WL 5351342
     at *21 n.29. For the proposition
    that varicella vaccine could remain latent and reactivate in the same manner as varicella
    virus, the Gershon Article referred to two medical journal articles: I. Kamiya et al.,
    Viremic Phase in Leukemic Child After Live Varicella Vaccination, 89 Pediatrics 147 (1992),
    and S. Weinmann et al., Incidence and Clinical Characteristics of Herpes Zoster Among
    Children in the Varicella Vaccine Era, 208 J. Infectious Disease 1859 (2013). Upon
    reviewing those unfiled articles, the Chief Special Master observed, in a footnote, that
    neither article “appear to stand strongly for the proposition that a vaccine administered
    years before could have the same reactivation potential as the wild virus” and thus
    “does not identify strong support for Dr. Gershon’s assertions.” A.Y., 
    2020 WL 5351342
    at *21 n.29. These articles, however, were not filed by the [* * *] and the Chief Special
    Master did not notify them that he would consider or otherwise address these sources
    as part of his decision. See Pet. Mot. at 17 n.12 (asserting that the Chief Special Master’s
    critique of these sources was prejudicial to their claim).
    This gives the Court some pause. On the one hand, a learned colleague of this
    Court has concluded, on facts similar to those at issue here, that it is improper for a
    special master to undertake a review of materials that were not expressly submitted for
    4The Court notes, however, that it would be inappropriate for a special master to take judicial
    notice of information posted on unreliable websites. See Campbell, 69 Fed. Cl. at 780-82 (finding
    that a special master committed reversable error in relying on information, not submitted by the
    parties, from Wikipedia and other websites which contained reliability disclaimers).
    5Because the [* * *] have not attempted to respond substantively to the medical information
    that the Chief Special Master consulted, such failure likely constitutes waiver. See Hines, 
    940 F.2d at 1526
    ; see also Vaccine Rule 8(f).
    - 13 -
    the record. See Davis v. Sec’y of Health & Human Servs., 
    94 Fed. Cl. 53
    , 64–66 (2010)
    (Lettow, J.) (holding that it was improper for the special master to draw an adverse
    inference from a medical study, which was cited in an article included in the record, not
    itself submitted by the petitioner). On the other hand, in the special master’s role as fact
    finder, he or she must examine an expert opinion’s analysis and not just accept the
    expert’s ipse dixit conclusions. See Isaac v. Sec’y of Health & Human Servs., 
    108 Fed. Cl. 743
    , 768 (2013) (“[A] special master does not need to credit expert opinion testimony
    that is connected to the existing data or methodology only by the ipse dixit of the
    expert . . . .” (internal citation marks and footnote omitted)). To the extent that the
    Gershon Article effectively incorporated other articles by reference to support its
    analysis, the Court cannot conclude that the Chief Special Master improperly reviewed
    those cited articles as well. Cf. Advanced Display Sys., Inc. v. Kent State Univ., 
    212 F.3d 1272
    , 1282 (Fed. Cir. 2010) (“Incorporation by reference provides a method for
    integrating material from various documents into a host document . . . by citing such
    material in a manner that makes clear that the material is effectively part of the host
    document as if it were explicitly contained therein.” (emphasis added)); Love Terminal
    Partners v. United States, 
    97 Fed. Cl. 355
    , 385 (2011) (noting that “Courts ‘have allowed
    consideration of matters incorporated by reference or integral to the claim’” in deciding
    a motion to dismiss (quoting 5B Charles A. Wright & Arthur R. Miller, Federal Practice
    & Procedure § 1357 (3d ed. 2004))). If a special master were not permitted to evaluate
    the substance and articulated rationale supporting a particular piece of scientific
    evidence, that would be tantamount to concluding that a special master must accept an
    expert’s ipse dixit. Put differently, the Court does not see why a special master’s review
    of citations that Petitioners themselves effectively have placed into the record is all that
    different from checking an expert’s math.
    The Court need not definitively resolve that issue, however, because just as
    Judge Lettow ultimately concluded in Davis, 94 Fed. Cl. at 66, even if the citations the
    Chief Special Master considered are deemed outside of the record – and thus
    improperly considered – it was harmless error. When “the special master’s decision
    was based on a number of factors and [petitioner] has not shown that the reliance on the
    [information] . . . was likely critical to the result,” such a mistake constitutes “harmless
    error” and does not justify reversing the special master’s decision. Hines, 
    940 F.2d at 1526
    ; see Doe v. Sec’y of Health & Human Servs., 
    601 F.3d 1349
    , 1356 n.2 (Fed. Cir. 2010)
    (holding that the special master taking judicial notice of table of brain weights “was
    harmless[, as t]his table was not the only fact the special master relied on, or even the
    most important one, in declining to credit Dr. Shane’s theory” (internal citation
    omitted)); see also Broekelschen, 
    618 F.3d at
    1346–47 (characterizing assessment of witness
    demeanor as “at most . . . harmless error”); Cedillo, 617 F.3d at 1342–44 (“any error in
    - 14 -
    considering the . . . testimony was, in fact harmless, as it did not affect the outcome of
    the proceeding”).
    In this case, the Court concludes that there is significant other evidence in the
    record, as detailed in the following section, that the Chief Special Master relied upon in
    rejecting Dr. Gershon’s causation theory in this case. See infra Section III.C. Moreover,
    the Chief Special Master made his observations of the Gershon Article based on his
    review of the two unfiled articles in a footnote, not in the body of his decision, further
    indicating that these referenced articles played a minimal role in his ultimate decision.
    Given the totality of the record evidence and the [* * *]’ failure to show that the Chief
    Special Master substantially relied on his outside-the-record research in reaching his
    ultimate decision, the Court concludes that, even if this action was improper, it was
    harmless error.
    C.     The Chief Special Master Did Not Act Arbitrarily In His Evaluation
    Of Dr. Gershon’s Expert Opinion
    “[A]s the finder of fact, the special master [is] responsible for assessing the
    reliability of [the expert's] testimony by looking for reliable medical or scientific
    support.” Lalonde v. Sec'y of Health & Human Servs., 
    746 F.3d 1334
    , 1340 (Fed. Cir. 2014).
    The special master “is not required to accept an expert's opinion simply because the
    expert is found qualified to opine in a medical or scientific discipline.” Bean-Sasser v.
    Sec’y of Health & Human Servs., 
    127 Fed. Cl. 161
    , 165 (2016). While “[a] finding of
    preponderant evidence of causation in fact may be based on medical opinion
    alone[,] . . . the special master is entitled to require some indicia of reliability to support
    the assertion of the expert witness.’” Davis, 94 Fed. Cl. at 63 (internal citation omitted)
    (quoting Moberly, 
    592 F.3d at 1324
    ); see Snyder v. Sec’y of Health & Human Servs., 
    88 Fed. Cl. 706
    , 743 (2009) (“A [special master] may conclude that there is simply too great an
    analytical gap between the data and the opinion proffered.” (quotation omitted)).
    When it is evident that the special master “clearly considered all of the pertinent
    evidence provided[, t]his Court cannot reweigh the evidence at hand to arrive at a new
    conclusion without infringing upon the great deference afforded special masters in
    making compensation decisions.” Caruso v. Sec’y of Health & Human Servs., 137 Fed Cl.
    386, 394 (2018) (emphasis in original).
    The [* * *] contend that the Chief Special Master did not afford appropriate
    deference to Dr. Gershon’s expert testimony that: (1) it is medically acceptable that the
    varicella vaccine could reactive many years later; and (2) A.Y. was actively experiencing
    a varicella infection in 2015. Pet. Mot. at 18–20. Petitioners attempt to frame this
    argument as the Chief Special Master’s having “committed legal error” by raising their
    “burden of proof by requiring direct evidence and scientific confirmation . . . rather than
    - 15 -
    a preponderance of the evidence.” Pet. Mot. at 18, 20. Under such a theory, this Court
    would need to undertake a de novo review. See Munn, 
    970 F.2d at
    870 n.10. However, a
    fair reading of the [* * *]’ argument reveals that they essentially contest the Chief
    Special Master’s assessment of Dr. Gershon’s credibility. Accordingly, as with any time
    this Court is asked to reweigh the special master’s evaluation of an expert’s
    persuasiveness, this claim is properly viewed under the deferential “arbitrary and
    capricious” standard of review. See Milik v. Sec’y of Health & Human Servs., 
    822 F.3d 1367
    , 1380 (Fed. Cir. 2016).
    Petitioners assert that Dr. Gershon is “a leading expert in the field [of varicella
    latency and reactivation] who remains unchallenged in the record.” Pet. Mot. at 19.
    The Chief Special Master, however, acknowledged both Dr. Gershon’s credentials and
    her conclusion that it was medically accepted that the varicella virus could remain
    dormant and reactivate years later. A.Y., 
    2020 WL 5351342
     at *7, *17–*18. Nevertheless,
    based on the record, the Chief Special Master also found that “Petitioners have offered
    no evidence establishing what period of time from vaccination to reactivation would be
    medically acceptable” in terms of attributing the reactivation to the vaccine. Id. at *21
    (emphasis in original). The Chief Special Master further expanded on this point, noting
    that, because “varicella vaccine (which includes a live but attenuated varicella virus
    strain) is intended to be less virulent than the wild virus . . . it cannot simply be assumed
    that the same latency periods apply to both.” Id. (emphasis in original). He also
    determined that, given “the timeframe in question (from vaccination to onset) is so
    lengthy,” Dr. Gershon failed to appropriately consider all the various treatments that
    A.Y. received during that time. Id. at *22. In light of those myriads of treatments, many
    of which the Chief Special Master characterized as “lack[ing] general medical
    community or [autism] treater acceptance,” he was unable to conclude that there was
    “no possible intervening triggers” for the skin rash. Id. (emphasis in original).
    Regarding the [* * *]’ other contention that “[o]bjective medical testing showed
    that A.Y. had an active [varicella] infection,” Pet. Mot. at 19, the Chief Special Master
    explained that the record entirely lacks a confirmed diagnosis that the marks and rashes
    which A.Y. experienced in 2015 were actually varicella. A.Y., 
    2020 WL 5351342
     at *20.
    Additionally, the Chief Special Master observed, that A.Y. did not suffer from other
    indicia of a varicella infection, like fever, and that “[n]o blood testing, antibody
    findings, or other serologic evidence has been offered to corroborate that a varicella
    infection existed as of the winter of 2015.” 
    Id.
     On the contrary, the Chief Special Master
    noted Dr. Tachdjian’s opinion that A.Y.’s antibody tests “were not consistent with the
    conclusion that A.Y. had experienced a varicella infection.” 
    Id.
     (emphasis in original).
    Furthermore, even assuming that the skin rash was varicella, the Chief Special Master
    noted that, because the record revealed that the rash cleared up quickly with Acyclovir,
    - 16 -
    there was no basis for recovery pursuant to the Vaccine Act’s six-month rule. 
    Id.
     (citing
    42 U.S.C. § 300aa-11(c)(1)(D)(i)). Conversely, the Chief Special Master reasoned, to the
    extent that the record demonstrated that A.Y. had been using Acyclovir “throughout his
    life,” that would suggest that he had initial symptoms of varicella infections earlier in
    life, prior to 2015, thus barring compensation under the Vaccine Act’s three-year statute
    of limitations period. Id.
    While the Chief Special Master acknowledged Dr. Gershon’s findings of varicella
    strains in A.Y.’s intestine during the winter of 2015, the Chief Special Master reasoned
    that the report suffered from “reliability concerns.” Id. Dr. Gershon had created the
    report in 2017, two years after her review of the 2015 biopsy report and included “no
    substantive back-up data for the findings has been filed, making it impossible to
    confirm the accuracy of these representations.” Id. Moreover, the [* * *] did not
    provide any further corroborating evidence that the alleged evidence of the varicella
    strains in A.Y.’s intestine related to virus reactivation, especially when considering all
    the possible intervening causes during the prior seven years. Id.
    In sum, while the [* * *] clearly would have preferred that the Chief Special
    Master have afforded more weight to Dr. Gershon’s theory linking latency and
    reactivation of the varicella virus and the varicella vaccine and her analysis of A.Y.’s
    2015 biopsy, the Chief Special Master evaluated all the medical information available in
    the record in reaching his reasoned conclusion. The Chief Special Master did not
    simply disagree with Dr. Gershon’s conclusions; rather, he scrutinized her theory and
    accompanying analysis as applied to the specific facts of this case “and reached the
    reasonable conclusion that, in the absence of supporting studies or other evidence, [her]
    expert testimony was unreliable.” Caves v. Sec’y of Health & Human Servs., 
    100 Fed. Cl. 119
    , 133–34 (2011), aff’d, 463 F. App’x 932 (Fed. Cir. 2012). Because “[d]etermining what
    weight should be afforded to the testimony of a fact witness, expert witness, or medical
    records is a finding well within the discretion of the Special Master, . . . this Court will
    not endeavor to infringe upon that well-established discretion.” Caruso, 137 Fed Cl. at
    393.
    CONCLUSION
    For all the above reasons, the Court DENIES Petitioners’ motion for review and
    sustains the Chief Special Master’s decision. The Clerk shall enter JUDGMENT for
    Respondent accordingly.
    IT IS SO ORDERED.
    s/ Matthew H. Solomson
    Matthew H. Solomson
    Judge
    - 17 -