Hi Minimatron
I think that you mean Group B strep. This is a very common bacterium that can be often found on our bodies including the vagina. If your baby is infected with this bug (not common) and it is not detected early (again not common) then your baby can become very sick. Many places no longer bother testing for this bug, unless you are showing some symptoms, as it can come and go. For example you could be tested at 38 weeks and be positive then a week later if tested again you could be negative. The reverse is also true. If you tested negative at 38 weeks you could be positive a week or even a day later. Should your baby become infected, and again I say it is not all that common, then it is quite easy to treat if caught early.