( ( cause ( ( ( ( human disease ) but ) generally ) ( ( not ( a severe ) ) ( as ( A types ) ) ) ) ) . )
(ROOT (S (VP (VB cause) (NP (NP (JJ human) (NN disease)) (CC but) (RB generally) (NP (NP (RB not) (DT a) (JJ severe)) (PP (IN as) (NP (DT A) (NNS types)))))) (. .)))
cause human disease but generally not a severe as A types.
(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))))) (. .)))