My daughter got kicked out of daycare because she was suspected of being a strep carrier. She didn't get sick but other kids did and she was the new kid on the block. 2 months later, it was discovered that my niece was the carrier and had drug resistant strep so the sitter kicked her out, too and tried to get me to come back (I was paying more than my sister) but you can guess what I told her!
My youngest son got strep throat 4 times in 1 year. The 4th & final time was in mid-August when it is supposedly almost impossible. We demanded his tonsils be removed and he missed 2 weeks of school but he hasn't had strep again and that was 9 years ago.