Infectious Vasculitis

Disorder	Vasculitis	Epidemiology/Etiology	Clinical/Laboratory Findings
Infectious vasculitis	Small vessel vasculitis involving skin vessels	Children and adults Involves all microbial pathogens	Rocky Mountain spotted fever: tick transmission of Rickettsia rickettsiae; organisms invade endothelial cells; petechiae on palms spread to trunk Disseminated meningococcemia due to Neisseria meningitidis Capillary thrombosis produces hemorrhage into skin and confluent ecchymoses