Is there a doctor in the house?

My family and I have been ping around strep throat since Thanksgiving. Once it goes away for someone, another person gets it, then it will eventually get around again. I am feeling it starting up again with me today. (3rd time) I have disinfected everything MULTIPLE times, we are changing toothbrushes every time we get better. I am a kindergarten teacher, I'm sure it started there, but why can't I get it out of my house? Uggghh. I feel awful.... :(