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The aliens dont have any concept of bacteria or viruses. Where they come from there is no disease or illness, there are no germs or whatever to make them aware that such things may exist on Earth.
They are so driven by their huge, malevolent intellects that at no point does it cross their mind they could be vulnerable in any way.
Read the book!
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Battle Royalty, 2009
@Wolf_Scousemac
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