J.H.
Hi S.,
Everyone seems to have a lot of good ideas about how you might try to build up the immune system. I don't really have any advice about that other than lots of soap and water and good hand washing. In order to stop the strep from being passed back and forth, everyone in the family should be tested at the same time. Someone might be a strep carrier that doesn't get the illness. Also, have the family dog screened if you have one...they can be carriers as well. Best of luck!