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Medical Definition of Trichomonas gallinae
1. The species that causes avian trichomoniasis; the pigeon is the natural host, but the organism also occurs in turkeys, chickens, doves, hawks, falcons, and other birds; infection is most serious in young domestic pigeons, who acquire it from pigeon milk produced in the pigeon crop; other birds are infected from contaminated water or by feeding on infected birds. (05 Mar 2000)