( trichomoniasis ( , ( ( a ( protozoan infection ) ) ( ( caused ( by ( Trichomonas vaginalis ) ) ) ; ) ) ) )
(ROOT (S (ADVP (RB trichomoniasis)) (, ,) (NP (DT a) (NN protozoan) (NN infection)) (VP (VBD caused) (PP (IN by) (NP (NNP Trichomonas) (NNS vaginalis)))) (: ;)))
trichomoniasis, a protozoan infection caused by Trichomonas vaginalis;
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))