Eliza Welder v. HHS - Tdap, collagenous colitis / significant aggravation (2025)

On July 14, 2022, Eliza Welder filed a petition alleging that a Tdap vaccine administered on July 17, 2019 caused or significantly aggravated collagenous colitis. The public decision identifies her as an adult petitioner but does not state her exact age.

The case did not proceed to a merits finding. The public text indicates that petitioner had not supplied sufficient medical records or expert proof to establish entitlement.

Respondent did not object to dismissal but reserved its position on whether the claim had a reasonable basis for any later attorneys' fees request. On December 2, 2025, Chief Special Master Brian H.

Corcoran dismissed the petition for insufficient proof. The decision noted petitioner's stated intention to reject judgment and pursue any available civil action outside the Vaccine Program.