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.
但有些时候细小病毒感染一起繁殖系统疾病。猪细小病毒是通过口或鼻腔传到肠道，然后在肠道内进行复制，并通过粪便排毒。
PPV is transmitted either by mouth or through the nose passing into the intestine where it multiplies and is passed out in faeces.
要明了猪细小病毒对猪生殖系统的影响，重要的是要认识到猪生殖系统感染细小病毒常常发生，但是猪却不一定发病；但有些时候细小病毒感染一起繁殖系统疾病。
To understand the role of PPV in reproduction it is important to realize that reproductive infection usually occurs without disease, but sometimes there is infection with reproductive disease.
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