( ( Back ( to ( Top ( DENGUE ( VIRUS ( Disease ( Dengue fever ) ) ) ) ) ) ) ( , ( ( Breakbone ( fever Natural ) ) ( ( Hosts Unknown ) ; ) ) ) )
(ROOT (S (ADVP (RB Back) (PP (TO to) (NP (NNP Top) (NNP DENGUE) (NNP VIRUS) (NNP Disease) (NNP Dengue) (NN fever)))) (, ,) (NP (NNP Breakbone) (NN fever) (NNP Natural)) (VP (VBZ Hosts) (ADJP (JJ Unknown))) (: ;)))
Back to Top DENGUE VIRUS Disease Dengue fever, Breakbone fever Natural Hosts Unknown;
(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)))))))) (. .)))