In the absence of any other signs of illness in the breeding females, PPV disease can be suspected by increases in mummified pigs and small litter sizes.

• 如果一个繁殖母猪群在没有任何其他疾病症状的情况下，持续发生母猪产木乃伊胎数量增加和每窝产仔量下降，应怀疑本病。