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. 2012 Feb 21;6(2):e1472. doi: 10.1371/journal.pntd.0001472

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Clusters of DENV-1 are indicated by colored circles (purple = May–Aug 1999; red = Jan–Apr 2000; pink = Sep–Dec 2001; green = Jan–Apr 2002). No significant clusters of DENV-2 were identified during the study period.