"infest" in the verb sense
1. infest, overrun
invade in great numbers
"the roaches infested our kitchen"
2. invade, overrun, infest
occupy in large numbers or live on a host
"the Kudzu plant infests much of the South and is spreading to the North"
live on or in a host, as of parasites
Source: WordNet® (An amazing lexical database of English)
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