This disease generally doesn't last longer than a month and is highly unlikely to cause death, however is is extremely contagious and can be spread very easily.
Generally, breeding stallions can pick up CEM while breeding a mare, but will not ever show signs of the infection. They can then transfer the infection to mares. The mare will end up showing signs of infection, and the infection can cause problems with fertility and retaining a foal.
Symptoms in mares include:
- problems with conception
- uterine inflammation
- vaginal discharge
If you suspect your equine may have Contagious Equine Metritis, or if you want to get them tested, you can contact a veterinarian who can perform a blood test. If your horse tests positive, the veterinarian will likely recommend you flush the mare's uterus with a Clorhexadine solution as well as use antibiotic cream and oral medication. The infection generally has no permanent effects, although the fact that it is so easily spread is cause to take the infection seriously.