Amplification of the Sylvatic Cycle of Dengue Virus Type 2, Senegal, 1999–2000: Entomologic Findings and Epidemiologic Considerations

Details

• Alternative Title:
  Emerg Infect Dis
• Personal Author:
  Diallo, Mawlouth ; Ba, Yamar ; Sall, Amadou A. ; Diop, Ousmane M. ; Ndione, Jacques A. ; Mondo, Mireille ; Girault, Lang ; Mathiot, Christian
• Description:
  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.
• Subjects:
  Aedes Animals Dengue Virus Female Male Rain Research
• Source:
  Emerg Infect Dis. 9(3):362-367
• Pubmed ID:
  12643833
• Pubmed Central ID:
  PMC2958533
• Document Type:
  Journal Article
• Place as Subject:
  Senegal
• Location:
  Africa
• Volume:
  9
• Issue:
  3
• Collection(s):
  Emerging Infectious Diseases
• Main Document Checksum:
  urn:sha256:139eaecc473b56a692aee35e9bb4a88f09004ddebfe5833cf91e549e4bba692b
• Download URL:
  https://stacks.cdc.gov/view/cdc/13995/cdc_13995_DS1.pdf
• File Type:
  [PDF - 303.85 KB ]