( Pathogens ( ( are ( ( ( disease-causing agents ) , ) ( such ( as ( ( bacteria and ) viruses ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Pathogens)) (VP (VBP are) (NP (NP (JJ disease-causing) (NNS agents)) (, ,) (PP (JJ such) (IN as) (NP (NNS bacteria) (CC and) (NNS viruses))))) (. .)))
Pathogens are disease-causing agents, such as bacteria and viruses.
(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))))) (. .)))