Motovski A
Vet Med Nauki. 1975;12(1):87-90.
A varying epizootologic, clinical and morphologic picture was established in studying the course of the disease on six pig-breeding farms. The isolated strains showed differences in their virulence, cultural properties and physicochemical behaviour. Two of them had lowered virulence, and one showed affinity to the respiratory organs which corresponded to the peculiarities and course of the disease. It is concluded that the interaction between the virulence of the strains and the herd immunity results in the varying epizootologic course of the disease.
在六个养猪场研究该病的病程时，发现了不同的动物流行病学、临床和形态学表现。分离出的菌株在毒力、培养特性和理化行为方面存在差异。其中两株毒力降低，一株对呼吸器官表现出亲和性，这与疾病的特点和病程相符。得出的结论是，菌株毒力与畜群免疫力之间的相互作用导致了该病不同的动物流行病学病程。
