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The protozoan ''Trichomonas gallinae'' is a cosmopolitan parasite of pigeons and doves. Other birds such as domestic and wild turkeys, chickens, raptors (hawks, golden eagle, etc.) may also become infected. The disease in pigeons is commonly called canker. The same condition in birds of prey is called frounce.〔Kennedy, Murry J. “Trichomoniasis in Birds” Food Safety Division, Alberta Agriculture and Food. http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex4444〕 It is believed to be an ancient pathogen causing frounce-like symptoms in dinosaurs.〔 〕 In 2005, ''Trichomonas gallinae'' was first recognized as a cause of disease in British finches, with greenfinch and chaffinch most affected, although a range of garden birds have been found to be susceptible to the parasite.〔Region. "BTO: Parasite Threatens Britain's Garden Birds." Www.birdguides.com. 18 Aug. 2010. Web. 09 Dec. 2010. The protozoan has four anterior flagella and an undulating membrane on one side. An important diagnostic feature is the lack of a free posterior flagellum. ==Life cycle== ''T. gallinae'' is generally found in the oral-nasal cavity or anterior end of the digestive and respiratory tracts. The trichomonads multiply rapidly by simple division (binary fission), but do not form a resistant cyst. They therefore die quickly when passed out of the host.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Trichomonas gallinae」の詳細全文を読む スポンサード リンク
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