I have an 12 year old maiden mare at day 278. She had her last Pneumabort shot 9 days ago and the next day had a very slight pinkish purple sticky discharge from her vulva as well as edema of her udder. She had a little more of the same discharge 3 days later(still only around a tablespoon) and again today 4 days later maybe a teaspoon or two at most. The vet was out to see her yesterday and foal is alive and she otherwise seems fine and has normal temp. She has in past had a quite severe reaction to the pneumabort shot with very sore neck so she was given the shot in her butt this last time. Up until now she has been just fine, and has been followed by vet regularly. We are really thinking that the pneumabort shot may have caused this. The vet does not feel that this small amount of occasional discharge warrants any kind of intervention such as regumate/antibiotics at this time so we are watching her very closely.
I don't see how the pneumabort vaccine would cause her to start discharging. I would think it is just a coincidence. However I am surprised your vet wouldn't opt to ultrasound the mare if she is discharging and developing an udder at only 278 days. These can both signal a problem. Personally I would have her ultrasounded - it's better to be safe than sorry. My own mare had only a small (tablespoon) amount of bloody discharge at only 220 days. I had my vet ultrasound her uterus and he discovered a thickened placenta. If not for the early diagnosis and the treatment that followed I would not have a live foal - which I do Good luck with your mare and listen to your gut.
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