[7] Reliant to strain, temperature and time of exposure, AMPV is capable of resisting a pH from 3 to 9.

[4] 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,"[4] "or tracheal rales.

These respiratory signs are accompanied by depression, anorexia, and ruffled feathers”[4] The incubation needs 3 to 5 days[2] 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.

Infection with the virus is associated with swollen head syndrome, with swelling peri- and infraorbital sinuses, foamy eyes, nasal discharge.

[4] AMPV can be clearly diagnosed by laboratory test to identify viral genomes, antigens or antibodies.

There are various tests:[2] For virus isolation,[7] samples of the upper respiratory tract must be taken in an early stage of the disease, before the sixth day after infection.

[9] To protect the flocks live vaccines, including attenuated as well as inactivated, are used in Europe to control subtypes A and B.

For a hygienic environment, the organic material should be removed, both in gangway and drinking water but also disinfectants play a major role.