the return of a large number of animals or insects, usually ones that cause damage or disease, to a place where they were before

This cream protects against reinfestation for up to three months. 这款面霜可防止再次感染长达三个月。

The vet advised us to keep checking the ears for signs of re-infestation. 兽医建议我们继续检查耳朵是否有再次感染的迹象。

It is impossible to guarantee that there will be no reinfestations. 无法保证不会再出现扰害。