Abstract
Aedes aegypti mosquitoes are common vectors for dengue virus and chikungunya virus. In areas where both viruses cocirculate, they can be transmitted together. During a dengue outbreak in Delhi in 2006, 17 of 69 serum samples were positive for chikungunya virus by reverse transcription–PCR; 6 samples were positive for both viruses.
Highlights
Aedes aegypti mosquitoes are common vectors for dengue virus and chikungunya virus
We report detection by reverse transcription–PCR of co-infections with Chikungunya virus (CHIKV) and dengue virus (DENV) in clinical samples obtained during the 2006 dengue outbreak in Delhi, India
For many years, it appeared that CHIKV had disappeared from India, but late in 2005 the virus reemerged on Reunion Island and in India [3]
Summary
Chikungunya and Dengue Viruses, India ing hyperendemic to this region [8]. During 2006, DENV and CHIKV were detected in Delhi [14]. Because the clinical features of DENV and CHIKV are similar, CHIKV infections may go undiagnosed in DENV-endemic areas. In India, Ae. aegypti mosquitoes are primary vectors for DENV and CHIKV, and opportunities for co-infections in humans are increased by the feeding behavior of the mosquito [15], low socioeconomic conditions, and high population density. We report co-infections with DENV and CHIKV in India after a long absence of the viruses in this region. It is difficult to comment on increased severity of illness in patients with DENV/CHIKV co-infections because the num-
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