J.N.
I have tested positive for Strep B for both of my pregnancies. It is just a form (strain) of the streptococci bateria that lives on skin. When you are in labor, you will be treated with a powerful from of Penecillin (Penicillin F, I think). While you are immune to Strept B, a newborn is not and it can make them sick. However, if you are treated with the Penecillin while in labor, it kills the Strept B at that point (temporarily) and most babies are fine. It is one of the many bacterias that we co-exist with. One way to help minimize it and it's effects is to be sure to eat yogurt with 3 or more active cultures in it. I hope this helps.