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I personally think that, if humans infected with viruses mutate, they are considered B.O.W.s. And since Wesker and Jake are immune to viruses because of their blood, and Sherry was treated with the vaccine before she turned into what William was, they're not considered B.O.W.s. They're probably considered more as hosts of dormant viruses and/or people with antibodies.

This answer was submitted by: Anonymous    

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