title: Domestic transmission of Rift Valley Fever virus in Diawara (Senegal) in 1998.
abstract: In 1998, circulation of the Rift Valley Fever (RVF) virus was revealed in Diawara by detection of IgM antibodies in sheep and isolation of the virus from mosquitoes caught outside a village. A seroprevalence study was carried out. Finger-prick blood samples, individual and collective details were obtained. One thousand five hundred twenty people (6 months - 83 years) were included. Overall prevalence in this group was approximately 5.2%. The prevalence in infants (6 months - 2 years) was 8.5%. Age, gender, contact with a pond, presence of sheep, and abortion among sheep, and individual or collective travel history were not statistically associated with prevalence. Prevalence increased significantly when the distance to a small ravine, located in the middle of the village, decreased. The results suggest a low, recent, not endemic circulation of the virus. Culex quinquefasciatus was captured near the ravine. This mosquito, similar to Culex pipiens, can play a similar role in human-to-human transmission of the RVF virus.
authors.affiliation: Epidemiology Unit, Institut Pasteur, Dakar. marrama@pasteur.sn
authors.forename: Laurence
authors.initials: L
authors.lastname: Marrama
authors.forename: André
authors.initials: A
authors.lastname: Spiegel
authors.forename: Kader
authors.initials: K
authors.lastname: Ndiaye
authors.forename: Amadou A
authors.initials: AA
authors.lastname: Sall
authors.forename: Eugénia
authors.initials: E
authors.lastname: Gomes
authors.forename: Mawlouth
authors.initials: M
authors.lastname: Diallo
authors.forename: Yaya
authors.initials: Y
authors.lastname: Thiongane
authors.forename: Christian
authors.initials: C
authors.lastname: Mathiot
authors.forename: Jean Paul
authors.initials: JP
authors.lastname: Gonzalez
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003465:Culex; D005260:Female; D006306:Health Surveys; D006801:Humans; D015994:Incidence; D007223:Infant; D007303:Insect Vectors; D008297:Male; D008875:Middle Aged; D012295:Rift Valley Fever / Q000453:epidemiology* / Q000276:immunology; D012296:Rift Valley fever virus / Q000276:immunology / Q000302:isolation & purification*; D018570:Risk Assessment; D012307:Risk Factors; D012675:Senegal / Q000453:epidemiology; D016036:Seroepidemiologic Studies; D012756:Sheep
chemical_list: D000914:Antibodies, Viral