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Those aliens would bring own bacteria that could kill a lot of things if not everyrhing on Earth.

Somehow people have this "star trek" thinking, that hypothetical unknown microbes from other planet wont eat you alive, because you are somehow immune to them.

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I've never understood why alien bacteria are a perceived threat. Viruses and bacteria share the same genetic material as we do, and literally evolved to infect organisms of that ilk. I have always supposed that alien viruses would just be inert, and alien bacteria would rapidly die off in the inhospitable environment of an earth-organism's body.

Bacteria just eat what they can, (some) emit antibiotics to kill other bacteria and (some) emit own excrement that can be poisous.

We dont know what kind of genetic material those hypoyhetical aliens have. Also didt South America die to smallpox?

Btw. I never wrote about viruses.

A species which has mastered inter-stellar travel and tractor beams (/s) probably has some higher control over their own biology and sanitation practices.

Just because they're advanced in one domain doesn't mean they are also in an unrelated one.

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