Federal patent law defines patent infringement as “mak[ing], us[ing], offer[ing] to sell, or sell[ing]” a patented invention. Not an attorney, but seems like it would be quite a stretch to argue that becoming infected with a virus would fall under one of those categories.
Well, a virus replicates by forcing your cells to make more of the virus. Just sayin'.
I swear that's the plot to something I have heard of... wish I could be more helpful and suggest a link.