Warning on Alien Viruses

In 2008 I was running a car club and website. Didn't watch much TV. Didn't get cable until 2017, lol.
 
In War of the Worlds bacteria or disease ending up weakening the aliens but why would Earth bound pathogens attack something that's not from Earth, it would have no interest as said. The same, why would alien pathogens affect us? I suppose they might but it's a long shot I feel.
 
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