Medical Definition of fowl pox
: either of two forms of a disease occurring worldwide especially in chickens and turkeys that is caused by a poxvirus (species Fowlpox virus of the genus Avipoxvirus) transmitted by contact or by insect vectors:
a : a cutaneous form marked by proliferating lesions especially on skin lacking feathers that progress to pustules, warty growths, and scabs
— called also sorehead
b : a more serious diphtheritic form occurring as cheesy lesions of the mucous membranes of the mouth, throat, and eyes that sometimes coalesce into a false membrane
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