The virus is inactivated at after 30 minutes, and is destroyed by commonly used disinfectants. Even though younger birds appear to be more susceptible, the infection affects all ages. For fattening turkeys it dominantly concerns the upper respiratory tract while for laying hens it is a mild respiratory infection which leads to a dipping production of eggs, which can decrease up to 70% and inferiority. Other symptoms includes “serous, watery nasal and ocular discharge; frothy eyes; and conjunctivitis. At later stages, signs include mucopurulent, turbid nasal discharge; plugged nostrils; swollen infraorbital sinuses; and snicking, sneezing, coughing," which can lead to a prolapsed uterus if it is excessive "or tracheal rales. These respiratory signs are accompanied by depression, anorexia, and ruffled feathers”  The incubation needs 3 to 5 days and morbidity can reach 100% but depending on the age, constitution of the flock and secondary infections the mortality accounts 1 to 30% by turkeys. So clear identifying signs have not been identified in chickens or pheasants. Infection with the virus is associated with swollen head syndrome, with swelling peri- and infraorbital sinuses, foamy eyes, nasal discharge. In general, less than 40% of the flock becomes infected, and the mortality is around 2%. Young chickens become depressed or crowd together under heating lamps. Flocks become quiet after infection. Four to ten days after infection, microscopic infractions occurs which can lead to secondary bacterial infections. If there is no secondary infection and the flock is in good condition, birds can recover within 7-10 days. The swollen head syndrome in chicken is a milder form of the virus which often come along with coinfections by bacteria. AMPV can be clearly diagnosed by laboratory test to identify viral genomes, antigens or antibodies. There are various tests:   For virus isolation, samples of the upper respiratory tract must be taken in an early stage of the disease, before the sixth day after infection. After this time it is more difficult to isolate the replicating aMPV. The most common test to diagnose aMPV is the ELISA test. AMPV is highly contagious mainly through oral transmission in direct contact or in contact with contaminated material. The spreading depends on the flock density, the standard of hygiene and the biosecurity within the flocks. The virus is replicated in the reproductive and also respiratory system.