Marc Howard v. HHS - Tdap, Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) (2022)
Case summary [AI summaries can sometimes make mistakes]
Marc Howard, a 42-year-old adult, received a Tdap vaccine on February 14, 2014. He alleged that this vaccine caused him to develop Chronic Inflammatory Demyelinating Polyneuropathy (CIDP), initially presenting with symptoms of Guillain-Barré Syndrome (GBS) approximately three weeks after vaccination.
His symptoms included pain, tingling, numbness, and weakness in his extremities, leading to hospitalization and a diagnosis of GBS, later amended to CIDP. Mr.
Howard presented medical records detailing his symptoms, diagnoses, and treatments, including IVIG therapy and physical rehabilitation. He also submitted expert reports from Dr.
Kazim A. Sheikh, who opined that the Tdap vaccine was a substantial factor in causing his CIDP, proposing several potential mechanisms including molecular mimicry.
The respondent, the Secretary of Health and Human Services, presented expert testimony from Dr. Timothy Vartanian, who argued that the vaccine-induced CIDP theory was implausible and that an antecedent respiratory infection was a more likely cause.
The Special Master denied entitlement, finding that Mr. Howard failed to establish by a preponderance of the evidence that the Tdap vaccine can cause CIDP or did so specifically in his case.
The court later affirmed this decision on review, agreeing that the petitioner did not meet the burden of proof for causation under the Althen prongs, particularly regarding the specificity of the medical theory and the logical sequence of cause and effect. The case was ultimately denied.