TY - JOUR AU - Diallo, Mawlouth AU - Ba, Yamar AU - Sall, Amadou A. AU - Diop, Ousmane M. AU - Ndione, Jacques A. AU - Mondo, Mireille AU - Girault, Lang AU - Mathiot, Christian T1 - Amplification of the Sylvatic Cycle of Dengue Virus Type 2, Senegal, 1999–2000: Entomologic Findings and Epidemiologic Considerations T2 - Emerging Infectious Disease journal PY - 2003 VL - 9 IS - 3 SP - 362 SN - 1080-6059 AB - After 8 years of silence, dengue virus serotype 2 (DENV-2) reemerged in southeastern Senegal in 1999. Sixty-four DENV-2 strains were isolated in 1999 and 9 strains in 2000 from mosquitoes captured in the forest gallery and surrounding villages. Isolates were obtained from previously described vectors, Aedes furcifer, Ae. taylori, Ae. luteocephalus, and—for the first time in Senegal—from Ae. aegypti and Ae. vittatus. A retrospective analysis of sylvatic DENV-2 outbreaks in Senegal during the last 28 years of entomologic investigations shows that amplifications are periodic, with intervening, silent intervals of 5–8 years. No correlation was found between sylvatic DENV-2 emergence and rainfall amount. For sylvatic DENV-2 vectors, rainfall seems to particularly affect virus amplification that occurs at the end of the rainy season, from October to November. Data obtained from investigation of preimaginal (i.e., nonadult) mosquitoes suggest a secondary transmission cycle involving mosquitoes other than those identified previously as vectors. KW - dengue virus KW - mosquitoes KW - sylvatic KW - Kedougoa KW - Senegal KW - research DO - 10.3201/eid0903.020219 UR - https://wwwnc.cdc.gov/eid/article/9/3/02-0219_article ER - End of Reference