Trichomonas vaginalis : Trichomonads are cyanophilic .flagellate protozoa,  shape like a pear,varying  in diameter from 15 to 30 microns.The nucleus is vesicular, pale, eccentrically located, and the cytoplasm.Sometimes contains eosinophilic granules. They are seen here in a coccal background . Note inflammatory backgroundof debris and polymorphs.Clinically infection is characterised by offensive copious yellow /green vaginal discharge.