Strain 1 is a bugger, but this reminds me that I've got to get the basic mechanic for other-than-humans becoming vampires worked out. It's pretty rare, maybe as rare as Bruckner-Langer, but I'm not quite sure how to model it in game terms. Yet.
But I think the original presentation, with a footnote saying, "You might turn into a vampire anyway, if the virus is feeling out-of-sorts or particularly bastardly," would probably suffice.