Isolation Protocal Post-Breeding to EVA Positive Semen

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Isolation Protocol Post-Breeding to EVA Positive Semen

Mares bred to EVA positive stallions must:

1. Tested for serological status and vaccinated for EVA following MBAH vaccination protocol.

2. Placed in isolation for 21 days post breeding.

3. 1st time vaccinated mares often undergo low grade viremia post insemination on the first breeding, and therefore are at highest risk of exposing other horses.

4. It is especially important to prevent exposure to pregnant mares


In Barn - have at least 2 stalls separating the vaccinated horse from other non-vaccinated or unknown status horses.

Follow appropriate biosecurity measures to prevent spread of EVA virus to other horses

  • Feed/water/clean that stall last; do not go from that stall to negative stall.
  • Disinfect all equipment that comes into contact with isolated horse; halters, lead ropes, shovels wheelbarrows etc.
  • Dump manure/shavings etc. from isolation stall in area where other horses can not come into contact.

Pasture Isolation - must not have direct or across the fence contact with negative or unknown status horses.

Follow appropriate biosecurity measures to prevent spread of EVA virus to other horses

  • Feed/water/clean paddock last; do not go from that paddock to negative paddock.
  • Disinfect all equipment that comes into contact with isolated horse; halters, lead ropes, shovels wheelbarrows etc.
  • Dump manure/shavings etc. from isolation stall in area where other horses can not come into contact.