Tetratrichomonas gallinarum

Tetratrichomonas gallinarum (formally known as Trichomonas gallinarum) is a flagellated protozoan parasite that is commonly found in gallinaceous bird species, particularly chickens, ducks, turkeys, and partridges. Lesions have also been documented in waldrapp ibis, mockingbirds, and pelicans.

T. gallinarum infection causes granulomas in the caecum and the liver, similar to lesions seen in cases of histomonosis.