对于这些疾病早期很少或没有症状，并且无有效的筛查试验。
There are few or no symptoms early in the disease and no effective screening tests.
澳大利亚的猪饲养在几乎无疾病状态。
没有明显的胃肠道感染诱因，并且既往无胃肠道疾病史。
There was no obvious cause of gastrointestinal infection and history of gut diseases.
前脑无裂畸形是一种很严重的疾病，大脑功能很差或没有。
Holoprosencephaly is a grave condition with little or no brain function.
无严重心、脑、肝、肾疾病及其他严重的躯体疾病；
No other complications such as heart disease, hepatic disease and renal disease.
无严重心、脑、肝、肾疾病及其他严重的躯体疾病；
No other complications such as heart disease, hepatic disease and renal disease.
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