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>>4959
Fortunately (or unfortunately) I recall a physicist theorizing that intersection events should only occur between parallel universes that were close together, so any universe that's different enough with rules of physics that support the shambling dead is too far out to intersect with outs.
Well, theoretically. Given an infinite number of cases even the impossible could become possible.
>>4960
>walking carp that eat and mate all the time.
If you're looking for horny fishmen then "Humanoids from the Deep" might be up your alley.
That being said, a virus isn't a likely candidate for two reasons: first is that it's not a living organism by itself, it's just a bit of DNA in a protein sheathe, so its only evolutionary mechanism is bogarting DNA from the host (in the simplest term, a virus cannot become a zombie virus unless it infects someone who is already zombie, but even then it's impossible for it to inherit everything that would recreate that zombie); the second reason is viruses only attack specific cells because the protein sheathe is "keyed" to those cells - there is no universally accepted protein "key" and viruses can't alter the sheathe by themselves, so you'll never see a single virus that can infect every cell (or even a majority, which would be required to turn an person into a zombie) - it would have to be an entire spectrum of viruses, each targeting different cells in the body, each with a specific fragment of "zombie" DNA that will work in conjunction with the other virus packages (which is impossible to occur naturally, it would most certainly have to be artificially produces and administered).
tl;dr: Viruses don't work that way.