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Okay, this is going to be a vague description because I saw this movie when I was a kid. It was made in the 80s and seemed to be set in some kind of underground facility. The cast were being wiped out one by one by what I can only assume was a virus. They would vomit up a black tar-like substance before giving up the ghost. Can anyone help?

was it the awakening?im not for sure though..lol

Just called that up on imdb and I don't think its the movie i'm after. I could be wrong, but I think the virus in this film began with a rat bite.

nope changed my mind ,,,

Rat bite? Hmmm... Dead Alive?

AKA Braindead? No, definately not that. I really not certain about the rat bite, I can just remember the victims vomiting up the tar before snuffing it.