ABSTRACT
CASE 2 An 8-year-old Thoroughbred gelding developed acute anorexia and a fever of 103.2°F (39.6°C). It was winter and there was snow on the pasture. There had been no recent shipping, exposure to other horses, or any other typical risk factors for infectious disease. The deworming history was good. This horse had a similar complaint in the spring 5 years earlier (2.1), at which time Actinobacillus spp. peritonitis was confirmed and treated successfully. He was reported to have been in good health since that time. On presentation, physical examination was unremarkable other than anorexia, fever, mild tachycardia, and absence of gut sounds.
