Background
Michael Johnson sought compensation under the National Vaccine Injury Compensation Program, alleging that an influenza vaccine he received on October 28, 2020 caused autoimmune hemolytic anemia (AIHA). Because AIHA is not a listed injury for flu vaccines, Johnson had to prove causation in fact under the three-part Althen test.
The Chief Special Master denied entitlement after finding that Johnson had not established a reliable medical theory connecting the flu vaccine to AIHA or a medically acceptable timeframe for causation. Johnson’s expert, Dr. Clinton Merrill, withdrew from participation in the Vaccine Program before the scheduled hearing. Although Johnson initially said he had retained a new expert, he jointly elected to proceed on the existing paper record without a hearing.
The Court’s Holding
Judge Stephen S. Schwartz denied Johnson’s motion for review and sustained the Chief Special Master’s decision. The court held that the Special Master applied the correct standard to Althen’s first prong: Johnson needed a reliable medical theory specific to the vaccine and injury, not merely a biologically plausible theory. The Special Master’s conclusion that Johnson’s evidence did not meet that burden was neither arbitrary nor capricious.
The court also upheld the finding that Johnson’s symptoms began on the vaccination date and that blood work five days later indicated AIHA was already occurring—timing the Special Master reasonably found too rapid for the alleged autoimmune process. The court rejected Johnson’s request to remand for a new expert report because he had been offered time to obtain and present new expert evidence but chose instead to proceed on the paper record.
Key Takeaways
- Off-Table Vaccine Act claims require a reliable vaccine-specific medical causation theory, not just biological plausibility.
- A temporal relationship can fail the Althen test when symptoms arise too soon to support the claimed causal mechanism.
- A petitioner who elects to proceed without a hearing and without replacement expert evidence generally cannot seek a second opportunity after losing.
Why It Matters
The decision applies the highly deferential standard governing Court of Federal Claims review of special-master factfinding in Vaccine Act cases. It also reflects the Federal Circuit’s requirement that an off-Table claimant present a reliable, injury-specific causation theory supported by a preponderance of the evidence.
For vaccine practitioners, the case underscores the importance of preserving available expert-development opportunities and establishing evidence for both the proposed mechanism and a medically acceptable onset window before electing a paper-record ruling.