Parvo is highly contagious to unprotected dogs, and the virus can remain infectious in ground contaminated with fecal material for five months or more if conditions are favorable.

• 细小对于没有受到保护的狗具有极强的传染性，而且如果条件适合，病毒可以在被粪便污染的土地上存活5个月甚至更长的时间。