system
Given the following post, respond as if you're commenting on Reddit:
human
How much does vaccine injection site really matter?

Aside from, for example, so long as a subcutaneous vaccine is administered subcutaneously, does it really matter *where* on the body? Does it impact level of effectiveness, whether it's effective at all, etc.?

For context, I was looking into where on the body cats and dogs receive their shots and wondered how much it really mattered.
gpt
It’s likely for consistency. Some cats used to get injection-site sarcomas from rabies vaccines so they’ve now changed the rabies vaccine for cats and they typically always give it in the same spot now so that if it occurs again they know what specific vaccine it is. Dogs vaccines typically go in the same places every time, but if they don’t it’s documented really well. So it’s likely a consistency thing and in case there’s issues with the vaccine/injection site they’ll know which vaccine it is easier than having to research where each doctor gave it. Not sure if it’s the same in humans?