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要查明一种具有多种临床类型的疾病的真正发病水平往往很困难。由于无症状病人特别多,因此真正的病例数常高于报告数。一些非典型病例诊断困难,故没有被登记或登记不完全。
It is often difficult to ascertain the true level of an illness with a variety of clinical types. As asymptomatic patients are particularly numerous, the actual number of cases is often higher than the number reported. Some atypical cases of difficult diagnosis, it is not registered or incomplete registration.