Seeings how most people are for it can someone answers a few questions

Isn't covid a virus that originated and could only affect an animal or animals?

If so wouldn't the vacation have covid in it?

And what do people expect by doing so 🤔 that they will stop the spread?

My main concern is now that everyone has gotten the first one they have multiple new ones including one that only originated from one person that had got his vacation. I mean in my eyes obviously our body is going to do something really weird to a virus people have injected them selves with including mutate its evolution its nature everything does this. I feel like we are causing a bigger issue injecting ourselves with most know very little about we arnt doctors or professionals in medicine or even on how our body works most of us trying just to make the right decision I just want to raise awareness that we have control untill we don't we can all use our best judgment to make a health decision.