Jason Horn v. HHS - Tdap, shoulder injury related to vaccine administration (SIRVA) (2025)

On May 23, 2024, Jason Horn filed a petition alleging that tetanus-diphtheria-acellular pertussis (Tdap) and influenza vaccinations administered on September 18, 2023 caused a shoulder injury related to vaccine administration. He alleged the residual effects lasted more than six months.

Respondent denied that Mr. Horn sustained a Table SIRVA, denied that the Tdap and/or flu vaccines caused his alleged SIRVA or any other injury, and denied that his current condition was vaccine-related.

The public stipulation does not describe which shoulder was affected, the first symptom, onset interval, medical visits, imaging, injections, therapy, or functional limitations. On November 13, 2025, the parties filed a joint stipulation.

Chief Special Master Brian H. Corcoran adopted it on November 14, 2025 and awarded Mr.

Horn $15,000.00 as a lump sum through counsel's IOLTA account for all damages available under the Vaccine Act. Mr.

Horn was represented by Jonathan Joseph Svitak of Shannon Law Group, P.C.