It's a Bruno Mattei "film." The proper English title is "Rats - Night of Terror," though, oddly, apparently the "Blood Kill" title was used only on the trailer.
Bruno Mattei films are best watched under heavy doses of alcohol.
Bruno Mattei might have a thing with rats… in the other movie of his I've seen (Virus, A.K.A. Zombi [some number beyond 2]) a rat SPOILERS! gets into a guy's biohazard suit and bugs him.