Displacement of dengue virus type 3 and type 2 by dengue virus type 1 in Delhi during 2008.

Dengue infection is an emerging disease in India, with reported endemicity of all the four serotypes. Delhi has witnessed several outbreaks since 1967, out of which, 1996, 2003, and 2006 are the major ones. Reports from the previous years show that since 1996, DEN-2 and DEN3 have been the major circulating serotypes during the various outbreaks.[1] However, our study in the year 2008, demonstrated DEN-1 to be the predominant serotype.

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