Task: Answer Verification
Input (English): Question: Are parvovirus B19 and parvovirus V9 associated with Henoch-Schönlein purpura in children?
Answer: Although causality is difficult to construe in single cases, the data indicate that B19 is not a common contributing factor in the pathogenesis of vasculitis and that this pathogen is only rarely associated temporally with HSP or vasculitic diseases in children.
Output (English): no