Aliens susceptible to human diseases?

We all know about how the aliens in War of the Worlds were killed by the common cold, but how susceptible would aliens really be to human diseases?

In my story, I have an alien species living among humans. The aliens are able to eat most of the same foods as the humans and have been on the planet for around six thousand years. Would they likely catch human diseases? Or would they be immune to them because the diseases would have to mutate immensely to affect them?

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Aliens susceptible to human diseases?

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