Skip to Content

Flu Avert I.N. Vaccine

This page contains information on Flu Avert I.N. Vaccine for veterinary use.
The information provided typically includes the following:
  • Flu Avert I.N. Vaccine Indications
  • Warnings and cautions for Flu Avert I.N. Vaccine
  • Direction and dosage information for Flu Avert I.N. Vaccine

Flu Avert I.N. Vaccine

This treatment applies to the following species:
Manufacturer: Intervet/Merck Animal Health


For Intranasal Use Only



This vaccine is a lyophilized preparation containing an attenuated, cold-adapted, viable equine influenza virus type H3N8 strain (EIV A/Equine 2/Kentucky/91). Contains no preservatives.

Flu Avert I.N. Vaccine Indications

For the vaccination of healthy horses 11 months of age or older, as an aid in the reduction of clinical disease and viral shedding caused by equine influenza viruses of both the American and Eurasian lineages.

Flu Avert I.N. Vaccine Cautions

Store at 2°-7°C (35°-45°F). Store out of direct sunlight. Use entire contents of the vaccine after rehydration. Do not vaccinate pregnant animals. Do no vaccinate within 21 days before slaughter. Burn this container and all unused contents. If allergic reaction occurs, treat with epinephrine. We recommend recommend that the vaccine be administered by a veterinarian or a trained technician. A small number of horses may experience mild post-vaccination side effects including slight nasal discharge. These signs should clear in a few days without additional treatment.



Administer a single 1 mL dose intranasally in one nostril.

Rehydration and Administration

Step 1: Securely attach a nasal applicator to a 3-cc luer lock syringe.

Step 2: Remove the cap and rubber stopper from one vial of diluent and one vial of vaccine.

Step 3: Using the nasal applicator with the attached syringe, draw 1 mL of the sterile diluent into the nasal applicator. The applicator should be nearly full, no diluent should be drawn into the syringe. Transfer the sterile diluent to the lyophilized vaccine vial.

Step 4: Mix the vaccine and diluent in the vial with a gentle swirling motion. Once dissolved, immediately withdrawn the full amount of rehydrated vaccine into the nasal applicator. Take caution not to draw vaccine into the syringe.

Step 5: Place the full length of the applicator into the nasal passage. The syringe should still be in full outside the nostril. Once in place, depress the plunger to administer the vaccine over approximately a 1-second interval. Withdraw and discard the applicator and syringe.

Step 6: After vaccination, there may be some residual vaccine in the applicator and a small amount may drip out of the nostril. This is normal, vaccination has been completed successfully.

Note: A new applicator should be used to vaccinate each horse. No needles are necessary to administer the vaccine. This vaccine is NOT intended for intramuscular or subcutaneous injection. For primary immunization, a single dose is required in horses 11 months of age or older. Horses vaccinated at less than 11 months of age should be given a dose of the vaccine at age 11 months. Revaccination every six months is recommended. Horses at high risk of exposure may benefit from revaccination every three months.

Intervet Inc., Merck Animal Health, division of Intervet Inc., Omaha, NE 68103, USA

U.S. Vet Lic. No 165A

1 800 521-5767 (USA)

1 866 683-7838 (Canada)

For patent information:





10 Doses (10x1 dose vials of lyophilized vaccine, 10 vials of sterile diluent and 10 nasal applicators)



NAC No.: 1047425.2

Intervet Inc.

Customer Service:   800-521-5767
Order Desk:   800-648-2118
Technical Service (Companion Animal):   800-224-5318
Technical Service (Livestock):   800-211-3573
Fax:   973-937-5557
Every effort has been made to ensure the accuracy of the Flu Avert I.N. Vaccine information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the US product label or package insert.

Copyright © 2017 North American Compendiums. Updated: 2017-04-21