RESUMEN
Aedes albopictus (Skuse) mosquitoes collected in Potosi, Mo., were tested for their ability to transmit a newly recognized Bunyamwera sero group virus isolated from the same mosquito population. Mosquitoes were fed artificial blood meals containing 4.5-6.2 log10 TCID50 of virus per ml. After 7-29 d at 25 degrees C, 79-99% of the mosquitoes had disseminated infections and 0-26% transmitted virus to fluid-filled capillary tubes. Transmission was first observed after 7 d of extrinsic incubation. Tests failed to detect transovarial transmission in 5,145 progeny from ovarian cycles 2-4. Following parenteral inoculation with 5.3-6.0 log10 TCID50 of virus, four of nine adult hamsters developed viremia. Ten of 16 suckling mice died following intracerebral inoculation of 5.0 log10 TCID50 of virus (fifth Vero cell passage); the average survival time was 8.8 d (SD, 3.5). No mortality occurred in 10 suckling mice inoculated with 3.6 log10 TCID50 of virus (second Vero cell passage).
Asunto(s)
Aedes/microbiología , Virus Bunyamwera/aislamiento & purificación , Infecciones por Bunyaviridae/transmisión , Insectos Vectores/microbiología , Animales , Animales Lactantes , Cricetinae , Femenino , Masculino , Mesocricetus , Ratones , Ratones Endogámicos ICR , MissouriRESUMEN
Eastern chipmunks were successfully infected with La Crosse virus by bites of 3 New World strains of Aedes albopictus infected orally or transovarially. The virus was subsequently passed from the chipmunks to Ae. albopictus, POTOSI strain, and Ae. triseriatus. The chipmunks developed viremias of 1-4 days duration and antibody titers were similar in intensity and duration to those reported in chipmunks infected by Ae. triseriatus. After feeding on viremic chipmunks, Ae. albopictus became infected and transmitted La Crosse virus at rates similar to the native vector, Ae. triseriatus. Aedes albopictus transmitted La Crosse virus transovarially to first gonotrophic cycle offspring.
Asunto(s)
Aedes , Virus de la Encefalitis de California , Encefalitis de California/veterinaria , Insectos Vectores , Enfermedades de los Roedores/transmisión , Sciuridae , Animales , Anticuerpos Antivirales/análisis , Virus de la Encefalitis de California/inmunología , Encefalitis de California/transmisión , Femenino , Enfermedades de los Roedores/inmunología , Especificidad de la EspecieRESUMEN
Twenty isolates of Jamestown Canyon virus were obtained from adult females of 5 Aedes species collected at the Houghton Lake Wildlife Research Area, Missaukee County, in north-central Michigan between 1985 and 1989. Fourteen were from Aedes provocans, and 6 were from 4 other snowmelt Aedes species. One isolate of trivittatus virus and one Cache Valley-like virus were also obtained. Seasonal succession patterns for numerous mosquito species were recorded over 4 years. The temporal association of adult mosquito emergence, virus isolations, and infection and seroconversion of sentinel deer suggest that Ae. provocans is a primary enzootic vector of Jamestown Canyon virus in that focus. We hypothesize that Ae. provocans provides an overwintering reservoir for Jamestown Canyon virus at the study site. A large dry ice-baited "tent trap" was the most productive method for collecting numerous aedine and other mosquito species.
Asunto(s)
Aedes/microbiología , Virus de la Encefalitis de California/aislamiento & purificación , Animales , Ciervos , Ecología , Virus de la Encefalitis de California/fisiología , Femenino , Interacciones Huésped-Parásitos , Insectos Vectores , Michigan , Estaciones del Año , Especificidad de la Especie , Tiempo (Meteorología)RESUMEN
The ability of 14 species of mosquitoes to biologically transmit Jamestown Canyon virus was tested. Four species not previously described as vectors of that virus transmitted to suckling mice. Among membrane-fed mosquitoes with disseminated infections, field-collected Aedes canadensis (1/3), Anopheles punctipennis (1/12), Coquillettidia perturbans (2/14) and a laboratory strain of Ae. epactius (19/67) transmitted virus. Two species were tested for their ability to transmit snowshoe hare virus: field-collected Ae. provocans (4/20) and Ae. abserratus-punctor (2/20) successfully transmitted to suckling mice. Evidence regarding the role of these species as field vectors is summarized.
Asunto(s)
Infecciones por Bunyaviridae/transmisión , Culicidae/microbiología , Encefalitis de California/transmisión , Insectos Vectores/microbiología , Aedes , Animales , Anopheles , Femenino , Intestinos/microbiología , Ratones , Especificidad de la EspecieRESUMEN
Blood samples of 34 Eastern chipmunks trapped in the vicinity of an Aedes albopictus population near New Alsace, IN, were tested for neutralizing antibodies to La Crosse (LAC) virus and other California group viruses. Two samples were positive for LAC antibodies. Analysis of mosquito bloodmeals demonstrated that both Ae. albopictus and Ae. triseriatus from the site fed on chipmunks. This note documents the first record of LAC antibodies in sylvan rodents from Indiana, the presence of LAC virus in the vicinity of Ae. albopictus and that wild Ae. albopictus feed on Eastern chipmunks.