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i wonder, people say they are afraid of an alien invation?

but when we went to America for the firs time all iour illnesses killed them. because they weren't immune, wouldn't it be even worse if its from different planets?
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Tinkerhell · 41-45, F
Bacterium and virus evolved with us, and with the hundreds of thousands of agents that can cause sickness there really aren't that many that can be passed to other species on our own planet. The chance of a bacterium infecting an alien species? Less than slim to none.
popmol · 22-25, M
even more slim if you think that the chance of aliens finding us being 0.0000000001 % or something