( ( Unlike ( yellow fever ) ) ( ( -LRB- ( ( ( ( caused ( by ( a ( related virus ) ) ) ) and ) ( spread ( by ( the ( same mosquito ) ) ) ) ) -RRB- ) ) ( there ( ( is ( ( no vaccine ) ( for ( dengue fever ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Unlike) (NP (JJ yellow) (NN fever))) (PRN (-LRB- -LRB-) (S (VP (VP (VBN caused) (PP (IN by) (NP (DT a) (VBN related) (NN virus)))) (CC and) (VP (VBN spread) (PP (IN by) (NP (DT the) (JJ same) (NN mosquito)))))) (-RRB- -RRB-)) (NP (EX there)) (VP (VBZ is) (NP (NP (DT no) (NN vaccine)) (PP (IN for) (NP (JJ dengue) (NN fever))))) (. .)))
Unlike yellow fever (caused by a related virus and spread by the same mosquito) there is no vaccine for dengue fever.
(ROOT (S (NP (NP (JJ Dengue) (NN fever)) (CC and) (NP (JJ yellow) (NN fever))) (VP (VBP are) (NP (NP (NNS examples)) (PP (IN of) (NP (NP (NNS diseases)) (VP (VBN caused) (PP (IN by) (NP (NN virus)))))))) (. .)))