( ( Protozoans and ) disease )
(ROOT (NP (NN Protozoans) (CC and) (NN disease)))
Protozoans and disease
(ROOT (S (NP (NP (JJ Protist) (NNS diseases)) (PP (IN in) (NP (NNS humans)))) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NN protozoa))))) (. .)))