( ( ( ( ( pathogen - ) ( ( an organism ) ( which ( causes disease ) ) ) ) , ) ( such ( as ( ( ( a bacteria ) or ) virus ) ) ) ) . )
(ROOT (NP (NP (NN pathogen)) (: -) (NP (NP (DT an) (NN organism)) (SBAR (WHNP (WDT which)) (S (VP (VBZ causes) (NP (NN disease)))))) (, ,) (PP (JJ such) (IN as) (NP (NP (DT a) (NNS bacteria)) (CC or) (NP (NN virus)))) (. .)))
pathogen -an organism which causes disease, such as a bacteria or virus.
(ROOT (S (NP (NNS Pathogens)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ disease-causing) (NNS agents))) (, ,) (PP (JJ such) (IN as) (NP (NNS bacteria) (CC and) (NNS viruses))))) (. .)))