Zoetis Animal Health Fluvac Innovator EHV-4/1 Equine vaccine protects healthy horses 10 months or older against equine irhinopneumonitis caused by type 1 and 4 viiruses and equine influenza caused by type A2. Give one 1 ml injection intramuscular and repeat in 2-4 weeks. Inject a 1 ml booster annually. Killed virus.