Group B Streptococcus (GBS) is a type of bacteria commonly found in the intestines and genital tract of healthy adults. While it usually does not cause harm, it can lead to serious infections in certain populations, particularly newborns, pregnant women, and individuals with weakened immune systems. In pregnant women, GBS can be passed to the baby during childbirth, potentially leading to infections such as pneumonia or meningitis. To prevent these complications, pregnant women are often screened for GBS during their third trimester, and antibiotics may be administered during labor if they test positive.