所有的狗都有可能感染犬瘟，但是四个月内的幼犬和没有注射过犬瘟疫苗的狗最易感染。
All dogs are at risk but puppies younger than four months old and dogs that have not been vaccinated against canine distemper are at increased risk of acquiring the disease.
兽医对犬瘟的诊断是以患狗的临床表现和实验室测试结果为依据。
Veterinarians diagnose canine distemper on the basis of clinical appearance and laboratory tests.
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