18th February 2024

A 32-year-old female presents with fevers and migratory arthralgia 12 days following her annual flu vaccine

A 32-year-old female presents with fevers and migratory arthralgia 12 days following her annual flu vaccine. She denies any immediate complications following the vaccinations. This was accompanied by a widespread purpuric rash sparing her mucous membranes and myalgia. Blood tests showed mild leukopenia with mildly raised CRP. C3 and C4 levels were reduced.

Given the likely diagnosis in this case, which of the following hypersensitivity reactions is responsible for the pathogenesis of this condition?

Select the SINGLE most appropriate option from the list below. Select ONE option only.