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At some point between 35 weeks and 37 weeks, you will be screened for a Group B streptococcus (GBS) infection. Group B strep is a bacterium that lives your digestive, urinary, and reproductive tract. It is usually harmless in adults, and you often show no signs of illness. But if you are infected and you pass it to your baby during childbirth, it can cause dangerous, and even life threateni