Posted 7/31/2018 21:04 (#6904350 - in reply to #6904282) Subject: RE: IBR in a herd
Marion,ks
We had that happened to us about 3 years ago. Vet said to use Zactran instead of LA200/300, vetrimycin spray. Also took a swab and found out that that strain was resistant to LA 300. Had a special vaccine made for that strain.