Henoch-Schonlein Purpura is most commonly preceded by which type of illness?

Henoch-Schonlein Purpura is most commonly preceded by which type of illness?

• A. Upper respiratory infection
• B. Gastroenteritis
• C. Urinary tract infection
• D. No preceding illness

Answer: (A)

IgA-mediated small-vessel vasculitis after a mucosal infection is the pattern being tested. Henoch-Schönlein purpura most commonly follows an upper respiratory tract infection, especially in children, because the mucosal immune response boosts IgA production and the resulting IgA immune complexes deposit in small vessels. This leads to the classic presentation of palpable purpura on the buttocks and legs, joint pains, and abdominal pain, with possible kidney involvement from IgA deposition in the glomeruli. Other infections like gastroenteritis or urinary tract infections can occur, but they are less typical antecedents, and some cases have no identifiable preceding illness.

IgA-mediated small-vessel vasculitis after a mucosal infection is the pattern being tested. Henoch-Schönlein purpura most commonly follows an upper respiratory tract infection, especially in children, because the mucosal immune response boosts IgA production and the resulting IgA immune complexes deposit in small vessels. This leads to the classic presentation of palpable purpura on the buttocks and legs, joint pains, and abdominal pain, with possible kidney involvement from IgA deposition in the glomeruli. Other infections like gastroenteritis or urinary tract infections can occur, but they are less typical antecedents, and some cases have no identifiable preceding illness.