Gamasoidosis, or dermanyssosis, is a frequently unrecognized ectoparasitosis and source of growing concern in human medicine, occurring after contact with avian mites which infest canaries, sparrows, starlings, pigeons and poultry and caused by two genera of mites, Ornithonyssus and Dermanyssus. Avian mite species implicated include the red mite (Dermanyssus gallinae), tropical fowl mite (Ornithonyssus bursa) and northern fowl mite (Ornithonyssus sylviarum). Mite dermatitis is also associated with rodents infested with the tropical rat mite (Ornithonyssus bacoti), spiny rat mite (Laelaps echidnina) and house-mouse mite (Liponyssoides sanguineus), where the condition is known as rodent mite dermatitis. Urban gamasoidosis is associated with window-sills, ventilation and air-conditioning inta