Conditions or ailments that are the cause of a problem that you see - your observation.

Your vet may diagnose

Placentitis, Placental Infection

Synonyms: Ascending Placentitis


Infection of the placenta is the most common cause of abortion in mares. It results from an infection that enters at the cervix and damages the connection between the mare's uterus and the placenta. It often occurs as a result of poor barriers of the pregnancy to the outside world (cervix and vulvar seal).

Treatment may or may not be successful and may maintain a pregnancy only to result in a weak, underdeveloped newborn. Foals born after placentitis are considered high-risk.

my vet's role


The prognosis is generally poor. It is difficult to control the infection and maintain a healthy pregnancy.

further reading & resources

Author: Doug Thal DVM Dipl. ABVP