You presume that their biological processes are similar to us, which isn't necessarily true. It almost seems unlikely to be true. If most of those diseases ca

You presume that their biological processes are similar to us, which isn't necessarily true. It almost seems unlikely to be true. If most of those diseases can't make the jump from a human to a fish or a bird that's from the same planet and even the same evolutionary line, it seems unlikely that we would be susceptible to each other's diseases. This isn't like when Europeans brought Small Pox to the New World; those were still humans.