Taken from the Resident Evil Wiki.
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Originally Posted by Resident Evil Wiki
Once injected, it blends with the victim's DNA and tries to merge with it, adaptating itself to the host's genetic sequence, potentially giving to its host tremendous capabilities, to the point of artificially forcing its evolution. However such instances are rare in the extreme, and hosts which would reject the virus will become its fodder, quite literally: as a parasitic organism, Uroboros will start devouring any organic matter in its surroundings so as to preserve its existence, eating away at the host body completely and turning its own cellular matter into countless blackish, leech-like pustules.
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At least in Excella's case, the virus was not a mutative agent but a devouring one, more like a parasite eating its host from the inside out than a TF. Seriously too bad, Excella is pretty close to an ideal TF victim for me...