Gary Giannantonio v. HHS - Varicella, acute disseminated encephalomyelitis (ADEM) (2023)
Case summary [AI summaries can sometimes make mistakes]
Gary Giannantonio filed a petition on April 4, 2018, on behalf of his daughter, C.G., alleging that a varicella vaccine administered on April 8, 2015, caused her to develop acute disseminated encephalomyelitis (ADEM). C.G., who was eight years old at the time, presented with fever and sore throat, followed by neurological symptoms including vision disturbance, gait disturbance, and altered mental state.
The medical records showed conflicting diagnoses among treating physicians, with initial considerations of ADEM, viral encephalitis, and Miller-Fisher syndrome. Crucially, MRIs of C.G.'s brain were normal, which is a key diagnostic criterion for ADEM.
The Special Master denied compensation, finding that C.G. did not have ADEM, as the evidence did not preponderate in favor of that diagnosis, particularly due to the normal MRIs and lack of clear evidence of central nervous system inflammation. Furthermore, the Special Master concluded that even if ADEM had been diagnosed, the petitioner failed to present a persuasive medical theory causally connecting the varicella vaccine to the condition.
This decision was affirmed on review by the Court of Federal Claims, which found the Special Master's factual determinations to be neither arbitrary nor capricious and noted that the petitioner had waived any challenge to the Althen prong 1 analysis by not properly raising it. Petitioner counsel was Phyllis Widman.
Respondent counsel was Sarah Rifkin and Althea Davis. Special Master was Christian J.
Moran. Chief Judge Elaine D.
Kaplan reviewed the case on appeal.
Theory of causation
Petitioner alleged that the varicella vaccine administered on April 8, 2015, to C.G., then eight years old, caused acute disseminated encephalomyelitis (ADEM). The Special Master denied compensation, finding that the evidence did not preponderate in favor of an ADEM diagnosis, primarily due to normal MRIs and lack of evidence of central nervous system inflammation. The Special Master also found that even if ADEM were diagnosed, Petitioner failed to present a persuasive medical theory causally connecting the varicella vaccine to ADEM, citing a lack of evidence for molecular mimicry or other autoimmune responses. Petitioner's expert was Dr. Georges A. Ghacibeh, and Respondent's expert was Dr. Michael C. Kruer. The Court of Federal Claims affirmed the Special Master's decision, noting that Petitioner waived challenges to the Althen prong 1 analysis and that the Special Master's factual findings were not arbitrary or capricious. The decision was issued by Special Master Christian J. Moran on February 1, 2023, and affirmed by Chief Judge Elaine D. Kaplan on August 3, 2023. Petitioner's counsel was Phyllis Widman, and Respondent's counsel included Sarah Rifkin and Althea Davis.