Songer J G, Chilelli C J, Marshall M M, Noon T H, Meyer R
Am J Vet Res. 1983 Sep;44(9):1763-4.
Sera from 1,215 beef cattle in Arizona were evaluated by leptospiral microscopic agglutination test in 1981. Over 25% had agglutinins to greater than or equal to 1 of 5 serovars of Leptospira interrogans used as antigens (canicola, grippotyphosa, hardjo, icterohaemorrhagiae, and pomona) at a titer of greater than or equal to 1:100, and 8.2% had titers of greater than or equal to 1:400 to greater than or equal to 1 serovars. The most common serovar to which reactions were detected was hardjo; agglutinins were detected at titers of greater than or equal to 1:100 in 14.3% and of greater than or equal to 1:400 in 5.5%. Cross reactions were rare at serum dilutions greater than or equal to 1:100 (2%) and extremely rare at greater than or equal to 1:400 (0.7%). Because vaccination with leptospiral bacterins is seldom practiced in Arizona beef cattle, a titer of greater than or equal to 1:100 may be useful in estimating incidence and prevalence of the disease and as an aid to diagnosis of leptospirosis.
1981年，通过钩端螺旋体显微镜凝集试验对亚利桑那州1215头肉牛的血清进行了评估。超过25%的肉牛对用作抗原的5种问号钩端螺旋体血清型中的1种或多种（犬型、爪哇型、哈德乔型、出血性黄疸型和波摩那型）的凝集素效价大于或等于1:100，8.2%的肉牛对1种或多种血清型的凝集素效价大于或等于1:400。检测到反应的最常见血清型是哈德乔型；在14.3%的肉牛中检测到效价大于或等于1:100的凝集素，在5.5%的肉牛中检测到效价大于或等于1:400的凝集素。在血清稀释度大于或等于1:100时交叉反应很少见（2%），在大于或等于1:400时极其罕见（0.7%）。由于亚利桑那州的肉牛很少接种钩端螺旋体菌苗，效价大于或等于1:100可能有助于估计该病的发病率和流行率，并辅助诊断钩端螺旋体病。
