RESPIVAC aMPV (turkey rhinotracheitis virus, live) is a veterinary vaccine used in chickens to provide active immunity against avian metapneumovirus (aMPV), a virus that can cause respiratory problems and reduced egg production in poultry. Helps reduce the severity of respiratory symptoms. Caused by aMPV. Applied directly into the nostrils and/or eyes, or added to the chickens' drinking water.