[ Space is wild dude. But without something like this, you'd get so many freaky super diseases that the galaxy would be a lot smaller, I'm sure... ]

Hah, nothing that weird. At least I don't think so? I once got bit by a bug that dug into my leg and started taking over it, but that wasn't really a disease, you know? At most I'd probably just get like a really bad stomach bug or maybe like a rash that won't go away. Humans are pretty resilient, but there's other species out there that would be in some pretty big trouble if they caught an off-planet disease.

[ Don't ask Peter about the time he caught an alien STD on Contraxia, he will deny everything. ]

Oh, yeah! They don't look much like these though. But lots of planets have all kinds of plants. Some of 'em are sentient, too.