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There's no way to know for sure, since this has not happened to anyone. The closest thing would be Lisa Trevor who had both T-virus and a Nemesis-parasite in her.
So this is just my speculation, but presumably the T-virus would turn the subject into a zombie and then spread to the parasite, either killing it, or turning it into a super-parasite of some sort. If the host was exceptional (like Lisa Trevor) he/she could absorb the parasite and mutate into a super-monster of some sort.