( Pathogens ( ( ( are not ) ( spread ( ( ( by ( blood-to-blood contact ) ) ( but rather ) ) ( from ( ( the ( salivary glands ) ) ( of ( the mosquito ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Pathogens)) (VP (VBP are) (RB not) (VP (VBN spread) (PP (PP (IN by) (NP (JJ blood-to-blood) (NN contact))) (CONJP (CC but) (RB rather)) (PP (IN from) (NP (NP (DT the) (JJ salivary) (NNS glands)) (PP (IN of) (NP (DT the) (NN mosquito)))))))) (. .)))
Pathogens are not spread by blood-to-blood contact but rather from the salivary glands of the mosquito.
(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)))) (. .)))