Monday, January 13
Question of the Day
A horse presents with distal limb edema in all four limbs (as seen below), petechiae of the mucous membranes, depression, and a low-grade fever of 101.9°F (38.8°C) [N = 99-101°F (37.2-38.3°C)]. Multiple horses in the stable recently suffered from an upper respiratory infection of undiagnosed etiology.
Which type of immune reaction is most likely responsible for the vasculitis in this horse?