ABSTRACT A 19-year-old
patient who mistakenly received two doses of
influenza vaccine 10 days before presentation, was admitted with malaise, weakness, and a purpuric non-blanching
rash most prominent on the
ankles followed by
abdominal pain and
hematochezia 72 h later. The
diagnosis of
influenza vaccine-related Henoch-Schonlein
vasculitis was made. This complication, although rare, is the most common
vasculitis related to
immunization.