Can you get an infection when you are on an antibiotic?

I was just wandering if things like an Appendicitis or yeast Infection can happen while on an antibiotic? I take one every day.
Yeast infections are incredibly common on antibiotics. Don't know about Appendicitis and as far as I know the doctors don't know why they occur either.

If you are on antibiotics everyday you should look into taking acidophilus. It is a naturally occuring bacteria that live in your intestines and vagina. Antibiotics can kill it off causing all sorts of problems. Although found in yogurt, they do offer a supplement and I always use it when on antibiotics.

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