( ( Unlike ( most ( primary pathogens ) ) ) ( , ( ( some ( opportunistic ( bacterial pathogens ) ) ) ( ( can ( ( ( colonize and ) grow ) ( in ( ( the biofilm ) ( in ( water ( system ( distribution lines ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Unlike) (NP (JJS most) (JJ primary) (NNS pathogens))) (, ,) (NP (DT some) (JJ opportunistic) (JJ bacterial) (NNS pathogens)) (VP (MD can) (VP (VB colonize) (CC and) (VB grow) (PP (IN in) (NP (NP (DT the) (NN biofilm)) (PP (IN in) (NP (NN water) (NN system) (NN distribution) (NNS lines))))))) (. .)))
Unlike most primary pathogens, some opportunistic bacterial pathogens can colonize and grow in the biofilm in water system distribution lines.
(ROOT (S (NP (NNP Water)) (VP (MD can) (VP (VB be) (VP (VBN boiled) (S (VP (TO to) (VP (VB kill) (NP (NP (NN giardia)) (CC and) (NP (RBS most) (JJ other) (NNS pathogens))))))))) (. .)))