That said, I wonder what their IBS rates are like. That can't be great for their gut biome.
In contrast though, she had a surgical operation last year (in the US). The hospital refused to give her antibiotics immediately following the operation, saying she probably wouldn't need it. This was shocking for her - and the surgical site actually did end up getting mildly infected.
I know gut biomes must be different but they must be orders of magnitude more different than I assumed. I don't know what else would explain a little dose nuking people's gut biomes, while we experience absolutely nothing.
Of course, going on them for years is pretty different from a course of a week or two, and different antibiotics will have different effects.