Avian Metapneumovirus is an upper respiratory tract infection of chickens and turkeys that is transmitted through the air or on fomites and equipment. It causes sudden onset of conjunctivitis, nasal discharge, and periocular edema. Clinical signs also include sneezing, nasal discharge, conjunctivitis, lacrimation, and periocular swelling. Lesions include sinusitis, rhinitis, tracheitis, and pneumonia. Diagnosis is made through observation of signs and lesions, as well as virus isolation and identification or serology.