( ( Some pathogens ) ( ( are ( ( spread ( from ( one person ) ) ) ( to ( another ( by ( direct contact ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NNS pathogens)) (VP (VBP are) (VP (VBN spread) (PP (IN from) (NP (CD one) (NN person))) (PP (TO to) (NP (NP (DT another)) (PP (IN by) (NP (JJ direct) (NN contact))))))) (. .)))
Some pathogens are spread from one person to another by direct contact.
(ROOT (S (NP (NP (JJ Pathogens) (NN spread)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (VP (VBZ stis) (PP (IN during) (NP (JJ sexual) (NN contact)))) (. .)))