Streptococcus agalactiae, also known as 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 newborns, pregnant women, and individuals with weakened immune systems. In newborns, GBS can cause conditions such as pneumonia, meningitis, and sepsis. Pregnant women may also experience urinary tract infections or complications during labor. Screening for GBS during pregnancy is important, as antibiotics can be administered to reduce the risk of transmission to the baby during childbirth.