Clinical, microbiological and pathological observations in laboratory beagle dogs infected with leptospires of the serogroup Sejroe.

In beagle dogs infections with two different serovars of serogroup Sejroe are described. Saxkoebing titres of 27 beagle dogs were controlled for 7 to 9 months. Dogs serologically positive for saxkoebing showed no clinical symptoms. From the urine, an isolation of the microorganisms was possible. At necropsy, there was no evidence of any changes related to the proven infection. Histopathologically, in animals with persistent titres a mild interstitial nephritis was found. No changes were observed in the liver. Another three beagle dogs died after about two days of acute clinical illness with febrile temperature, exsiccosis and hematuria. Histopathologically, incipient inflammation was seen in the liver and kidneys. Besides, hepatic cholestasis, renal hemoglobin casts and degeneration of renal tubular epithelia were observed. In concurrent animals, an infection with another serovar of serogroup Sejroe was proven serologically. This serovar was also isolated. Transmission and spreading of leptospirosis within animals shelters or laboratories from clinically healthy carriers and its prevention as well as the protection of animal caretakers are discussed. Since leptospires are sensitive to physical and chemical methods of disinfection, this is easily feasible. However, the optimal prevention appears to be a stock- or population-specific vaccination.