Rats feeding on a fallen U.S.S solider,soon causing the Raccoon City Destruction Incident.
Infected Rats in Raccoon City.
The rats of the sewers were the original carriers of the t-Virus that directly caused the Raccoon City Destruction Incident - as opposed to the leeches, which caused the outbreak in the Arklay Mountains. Infected rats do not normally attack humans. The only known example of an attack was on an injured USS member seen in the introductory movie to Resident Evil Outbreak