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本调查于1970～1973年,采用快速显微镜凝集试验(RMAT)在24个国家中共计检查了14,709只狗,结果发现他们的勾体抗体有10个血清型,其中大多数流行的是黄疸出血和犬型勾体。阳性率如下:秘鲁26.3％、智利18.4％、土耳其17.4％、澳地利16.0％、朝鲜15.0％、中国(台湾省)11.4％、日本9.8％、巴西7.7％、美国5.5％、英国4.5％、意大利3.5％、德国2.0％及加拿大0.4％。然而在澳大利亚、多米尼加、厄瓜多尔、埃塞俄比亚、
The survey examined a total of 14,709 dogs in 24 countries using the Rapid Microscope Agglutination Test (RMAT) from 1970 to 1973 and found that they had 10 serotypes of hook-antibody, most of which were bleeding from the jaundice and Dog-type hook body. The positive rates are as follows: Peru 26.3%, Chile 18.4%, Turkey 17.4%, Australia 16.0%, North Korea 15.0%, China (Taiwan) 11.4%, Japan 9.8%, Brazil 7.7%, United States 5.5%, United Kingdom 4.5% Italy 3.5%, Germany 2.0% and Canada 0.4%. However, in Australia, Dominica, Ecuador, Ethiopia,