system
Given the following post, respond as if you're commenting on Reddit:
human
Are viruses like colds and flu different depending on where you are?

In the UK I tended to get colds infrequently and very mildly. Since spending time in and then moving to the US it seems like here I seem to suffer much worse.

I figured colds and flu tend to travel pretty far and wide and wouldn’t vary much place to place.

However several people have suggested that my immune system is less equipped for variants here.

I’d love to know if it’s just been bad luck or if it’s just going to take a while to adjust.
gpt
Yes you are being exposed to variants you aren't yet immune to.  However there are other factors. If you are in a place, like a transport hub where there are loads of people bringing in new strains of disease you will get ill more often, also the environment can weaken your immune system, so if the climate is harsher or if there is more pollution.