Treml F, Nesnalová E
University of Veterinary Medicine and Pharmaceutical Sciences, Brno, Czech Republic.
Vet Med (Praha). 1995 Oct;40(10):305-9.
Antibodies to leptospiras were demonstrated in 91 cases (7.4%) out of 1,239 animals examined by serological assays of blood sera of cattle slaughtered in slaughter-houses and coming from 21 farms of one district. The antibodies were detected in animals coming from eleven out of the farms investigated (52.4%). The most frequent reactions were proved with leptospiras of the serovar L. grippotyphosa (61.8%) and with leptospiras of the serological group Sejroe (18.9%), rarely with leptospiras of the serovar L. icterohaemorrhagiae or copenhageni (5.7%). Antibodies to leptospiras of other serovars (L. canicola, L. bulgarica and L. hardjo) were demonstrated only as coagglutionations with the above-mentioned leptospira serovars. We failed to demonstrate leptospiras in the animals examined by culture examinations as well as by bacterioscopy. The results of examinations have shown that the cattle on Czech farms is also exposed to infections by various serovars of leptospiras. The infections are not accompanied by manifest clinical symptoms in many cases nor do they cause significant elimination of leptospiras in urine in the serologically positive animals. On the Czech cattle farms the occurrence of antibodies to leptospiras of the serovar L. grippotyphosa is prevailing; this serovar seems not to be expressly pathogenic to cattle and does not cause the formation of anthropurgic foci. Reduction in the occurrence of antibodies to leptospiras of this type is possible to achieve by preventing the contact with natural foci of this type. Hence the prognosis of epizootologic situation in bovine leptospirosis in the conditions of this country is relatively favorable. But special attention should be paid to animals bought and imported from foreign countries. These animals could be a source of some highly pathogenic serovars of leptospiras to cattle.
通过对来自某地区21个农场、在屠宰场宰杀的牛的血清进行血清学检测，在1239头被检测动物中，有91头（7.4%）检测出了钩端螺旋体抗体。在被调查的11个农场的动物中检测到了抗体（52.4%）。最常见的反应是与血清型波摩那钩端螺旋体（61.8%）以及血清群 sejroe 的钩端螺旋体（18.9%）发生反应，很少与黄疸出血型或哥本哈根型钩端螺旋体（5.7%）发生反应。其他血清型（犬型、保加利亚型和哈焦型）的钩端螺旋体抗体仅表现为与上述钩端螺旋体血清型的凝集反应。通过培养检查和细菌学检查，我们未能在被检测动物中发现钩端螺旋体。检查结果表明，捷克农场的牛也受到各种血清型钩端螺旋体的感染。在许多情况下，感染并未伴有明显的临床症状，在血清学呈阳性的动物中也不会导致尿液中钩端螺旋体的大量排出。在捷克的养牛场中，波摩那钩端螺旋体血清型的抗体最为普遍；这种血清型似乎对牛没有明显的致病性，也不会导致人畜共患病疫源地的形成。通过防止与这类自然疫源地接触，可以减少这类钩端螺旋体抗体的出现。因此，在该国的条件下，牛钩端螺旋体病的动物流行病学形势预后相对较好。但应特别注意从国外购买和进口的动物。这些动物可能是一些对牛具有高致病性的钩端螺旋体血清型的来源。
