Bacteria everywhere

Yet another case of bacteria turning up somewhere rather unexpected in the body:

The placenta, long thought to be sterile, is home to a bacterial community similar to the one found in the mouth, researchers report today. The microbes are generally non-pathogenic, but according to the authors of the study, variations in their composition could be at the root of common but poorly understood pregnancy disorders such as preterm birth, which occurs in one out of every ten pregnancies.....

The researchers also compared the placental microbiomes to those found in the vagina, gut, mouth and on the skin of non-pregnant women. They found that the placental microbiome was most similar to that of the mouth. The authors speculate that the microbes travel to the placenta from the mouth via the blood. The results reinforce data suggesting a link between periodontal disease in the mother and the risk of preterm birth, says Aagaard.