One of the most common was Leptotrichia, which can be found in the mouth and the vagina. Both gum disease and bacterial vaginosis have been linked with a higher risk of premature delivery.

• 一种最常见的微生物之一是纤毛菌，存在于口腔和阴道中。牙周病和细菌性阴道病都会造成较高的早产几率。