RESUMEN
After a period of heavy rainfall, an outbreak of Rift Valley fever occurred in southern Mauritania during September-November 2012. A total of 41 human cases were confirmed, including 13 deaths, and 12 Rift Valley fever virus strains were isolated. Moudjeria and Temchecket Departments were the most affected areas.
Asunto(s)
Culicidae/virología , Brotes de Enfermedades , Insectos Vectores/virología , Fiebre del Valle del Rift/epidemiología , Virus de la Fiebre del Valle del Rift/genética , Proteínas Virales/genética , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Animales , Niño , Preescolar , Femenino , Humanos , Masculino , Mauritania/epidemiología , Persona de Mediana Edad , Filogenia , Fiebre del Valle del Rift/mortalidad , Fiebre del Valle del Rift/transmisión , Fiebre del Valle del Rift/virología , Virus de la Fiebre del Valle del Rift/clasificación , Estaciones del Año , Análisis de Supervivencia , Proteínas Virales/clasificaciónRESUMEN
A Rift Valley fever (RVF) outbreak in humans and animals occurred in Mauritania in 2010. Thirty cases of RVF in humans and 3 deaths were identified. RVFV isolates were recovered from humans, camels, sheep, goats, and Culex antennatus mosquitoes. Phylogenetic analysis of isolates indicated a virus origin from western Africa.
Asunto(s)
Culex/virología , Brotes de Enfermedades , Insectos Vectores/virología , ARN Viral/genética , Fiebre del Valle del Rift/epidemiología , Virus de la Fiebre del Valle del Rift/genética , Adolescente , Adulto , Anciano , Animales , Camelus/virología , Femenino , Cabras/virología , Humanos , Masculino , Mauritania/epidemiología , Persona de Mediana Edad , Filogenia , ARN Viral/clasificación , Estudios Retrospectivos , Fiebre del Valle del Rift/mortalidad , Fiebre del Valle del Rift/transmisión , Fiebre del Valle del Rift/virología , Virus de la Fiebre del Valle del Rift/clasificación , Ovinos/virología , Análisis de SupervivenciaRESUMEN
In October 2003, 9 human cases of hemorrhagic fever were reported in 3 provinces of Mauritania, West Africa. Test results showed acute Rift Valley fever virus (RVFV) infection, and a field investigation found recent circulation of RVFV with a prevalence rate of 25.5% (25/98) and 4 deaths among the 25 laboratory-confirmed case-patients. Immunoglobulin M against RVFV was found in 46% (25/54) of domestic animals. RVFV was also isolated from the mosquito species Culex poicilipes. Genetic comparison of virion segments indicated little variation among the strains isolated. However, phylogenetic studies clearly demonstrated that these strains belonged to the East-Central African lineage for all segments. To our knowledge, this is the first time viruses of this lineage have been observed in an outbreak in West Africa. Whether these strains were introduced or are endemic in West Africa remains to be determined.