( ( Trichomoniasis ( in birds ) ) ( ( is ( caused ( by ( the ( protozoan ( Trichomonas gallinae ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Trichomoniasis)) (PP (IN in) (NP (NNS birds)))) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (DT the) (JJ protozoan) (NNP Trichomonas) (NN gallinae))))) (. .)))
Trichomoniasis in birds is caused by the protozoan Trichomonas gallinae .
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))