Erysipelas in caged laying chickens and suspected erysipeloid in animal caretakers.
Erysipelas was diagnosed in 2 succeeding caged layer flocks housed in the same building and was characterized clinically by sudden death. At necropsy, lesions comprised generalized congestion, hemorrhages in the skeletal muscles and visceral organs, and swelling of liver, spleen, and kidney with or without large irregular zones of necrosis. Focal to massive hepatic necrosis was seen histologically with minimal or no inflammatory reaction. Erysipelothrix rhusiopathiae was cultured from internal organs of affected birds in both outbreaks. Medication with penicillin in the feed controlled the mortality, but relapse occurred after cessation of medication. Two attendants who handled the dead birds in this building developed a painful localized infection of the fingers that later spread to the regional lymph node. The infection responded when antibiotic therapy for erysipeloid was initiated.