( ( ( No evidence ) ( of ( yellow ( fever ( or ( dengue ( virus circulation ) ) ) ) ) ) ) ( ( was observed ) . ) )
(ROOT (S (NP (NP (DT No) (NN evidence)) (PP (IN of) (NP (JJ yellow) (NN fever) (CC or) (NN dengue) (NN virus) (NN circulation)))) (VP (VBD was) (ADJP (JJ observed))) (. .)))
No evidence of yellow fever or dengue virus circulation was observed.
(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)))))))) (. .)))