Chorioamnionitis is a bacterial infection that occurs before or during labor. The condition occurs when bacteria infect the chorion, amnion, and amniotic fluid around the fetus. It can lead to a preterm birth or serious infection in the mother and the baby. This condition usually develops because of an infection that can occur when bacteria that are normally present in the vagina ascend into the uterus, where the fetus is located.
The most common causes of chorioamnionitis is E. coli, group B Streptococci, and anaerobic bacteria