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I did say that viruses could jump between species. That's the downside of raising animals, it puts us in close proximity to animals, and gives the virus opportunities to mutate into a strain which can infect humans. Viruses pass between humans with ease, but pass only between species with difficulty. Viruses can mutate from an avian virus into one that can infect humans only because humans and birds are related, if rather distantly.
An alien would be utterly unrelated to us. Think of a virus as a computer program. A program written for one version of Windows will run properly on the intended version (or at least it should). It might not run so well on some other version. Maybe it will run on Windows 98, maybe it won't. But it won't run on a Mac at all.
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