这也许解释了猪细小病毒分布广泛和很难从养猪环境中根除的原因。

This perhaps explains why it is so widespread and so difficult to remove from the pig environment.

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猪细小病毒感染的主要症状是产仔少，产不同大小的木乃伊胎，假孕和空怀母猪数量的增多。

The major signs are therefore small litter sizes, mummified pigs of different sizes, and increases in pseudo-pregnancies and not-in-pigs.

youdao