My neighbor is losing a huge number of cows (41 in 8 months!) His vet has been unable to diagnose. All lab tests have come back normal. I am concerned that this could cross the fence to my cows. Any suggestions for treatment or prevention would be appreciated. The cow I observed appeared to be fine at 4 pm - eating, no cough, etc. At 11 am the next day she was dead and bloated like she had been in the sun for 5 days. Small amount of blood in her ears, eyes, and mouth. No apparent signs of convulsive activity, no nasal discharge, she had vomited and evacuated her bowels. Loose stools, but no apparent blood. Neighbor says this is how he has found all the adult cows who have died except the vomiting - that is new. The calves that have died were found down, unable to stand, do not bloat like the adults, usually live for a day or two and have a severe white, mucopurulent nasal discharge, but no rattling with their breathing. This started in one pasture 8 months ago, but now the cows in a different pasture are dying and the first pasture has been fine for the last 3-4 months. Help!