| symptomatic la crosse virus infections of the central nervous system: a study of risk factors in an endemic area. | in most years, la crosse virus is the most common cause of reported mosquito-borne illness in the united states. the authors conducted a case-control study to determine if behavioral and environmental factors influenced the risk of la crosse virus illness. data were gathered on 31 serologically confirmed cases and 60 age-, sex-, and geography-matched controls in west virginia in 1987 and 1988. univariate analysis revealed minimal elevation of disease risk (odds ratios (ors) less than 2.0) with i ... | 1992 | 1357961 |
| absence of la crosse virus in the presence of aedes triseriatus on the delmarva peninsula. | between 1980 and 1984, field studies were conducted in 2 areas on the delmarva peninsula to identify the presence of la crosse (lac) virus. ovitraps were used to collect eggs of aedes triseriatus complex mosquitoes. no virus was obtained from 969 pools containing 22,370 adult mosquitoes reared from eggs. only 1 of 143 raccoon serum samples had neutralizing antibody to lac virus; 36 sentinel domestic goats, and 99 other wild mammal serum samples were negative. the apparent absence of lac virus ma ... | 1986 | 3507467 |
| newly recognized focus of la crosse encephalitis in tennessee. | la crosse virus is a mosquito-borne arbovirus that causes encephalitis in children. only nine cases were reported in tennessee during the 33-year period from 1964-1996. we investigated a cluster of la crosse encephalitis cases in eastern tennessee in 1997. medical records of all suspected cases of la crosse virus infection at a pediatric referral hospital were reviewed, and surveillance was enhanced in the region. previous unreported cases were identified by surveying 20 hospitals in the surroun ... | 1999 | 10028077 |
| la crosse encephalitis virus habitat associations in nicholas county, west virginia. | aedes triseriatus (say) population density patterns and la crosse encephalitis virus infection rates were evaluated in relation to a variety of habitat parameters over a 14-wk period. ovitraps and landing collections were used in a la crosse virus-enzootic area in nicholas county, wv. study sites were divided into categories by habitat type and by proximity to the residences of known la crosse encephalitis cases. results demonstrated that ae. triseriatus population densities were higher in sugar ... | 2000 | 10916297 |
| larval habitat characterization for aedes triseriatus (say), the mosquito vector of lacrosse encephalitis in west virginia. | the principal aim of this investigation was to provide quantitative information on the frequency of occurrence for aedes triseriatus (say) larvae in west virginia at 3 broad elevation categories, in different months of the year, and in specific types of larval habitats. | 2000 | 10921356 |
| first isolation of la crosse virus from naturally infected aedes albopictus. | la crosse (lac) virus, a california serogroup bunyavirus, is the leading cause of pediatric arboviral encephalitis in the united states and an emerging disease in tennessee, west virginia, and north carolina. human cases of lac encephalitis in tennessee and north carolina have increased above endemic levels during 1997 to 1999 and may represent an expansion of a new southeastern endemic focus. this report describes the isolation of lac virus from the exotic mosquito aedes albopictus. the discove ... | 2001 | 11747692 |
| habitat preferences and phenology of ochlerotatus triseriatus and aedes albopictus (diptera: culicidae) in southwestern virginia. | recently, the number of reported human cases of la crosse encephalitis, an illness caused by mosquito-borne la crosse virus (lac), has increased in southwestern virginia, resulting in a need for better understanding of the virus cycle and the biology of its vectors in the region. this study examined the spatial and temporal distributions of the primary vector of lac, ochlerotatus triseriatus (say), and a potential secondary vector, aedes albopictus (skuse). ovitrapping surveys were conducted in ... | 2003 | 14680103 |
| spatiotemporal oviposition and habitat preferences of ochlerotatus triseriatus and aedes albopictus in an emerging focus of la crosse virus. | the number of cases of encephalitis caused by la crosse virus recently has increased in southwestern virginia counties. this article presents results of a study conducted from may to september 2000 in wise county, va, that examined the area-wide oviposition activity and habitat preferences of ochlerotatus triseriatus and aedes albopictus, potential vectors of la crosse virus in the region. data from 490 ovitrap collections made throughout the county showed that mean oviposition activity througho ... | 2003 | 14710741 |
| possible congenital infection with la crosse encephalitis virus--west virginia, 2006-2007. | la crosse encephalitis virus (lacv) is a mosquitoborne bunyavirus of the california encephalitis serogroup. during 2003--2007, west virginia had the greatest number of cases (95) and highest incidence of lacv disease (5.1 cases per 100,000 population) of any state.* the majority of persons infected with lacv either have no symptoms or a mild febrile illness; a limited number experience encephalitis. although only 1%--4% of those infected with lacv develop any symptoms, children aged <16 years ar ... | 2009 | 19145220 |
| the spatial epidemiology and clinical features of reported cases of la crosse virus infection in west virginia from 2003 to 2007. | la crosse virus (lacv) is a major cause of pediatric encephalitis in the united states. since the mid-1980s, the number of reported cases of lacv infection in west virginia has continued to rise and the state currently reports the most cases in the united states. the purpose of this study was to investigate and describe the spatial epidemiology and clinical presentation of lacv infection cases reported in west virginia, as well as to provide a description of the environmental conditions present ... | 2011 | 21269495 |
| The demographic and socioeconomic factors predictive for populations at high-risk for la crosse virus infection in west virginia. | Although a large body of literature exists for the environmental risk factors for La Crosse virus (LACV) transmission, the demographic and socioeconomic risk factors for developing LACV infection have not been investigated. Therefore, this study investigated the demographic and socioeconomic risk factors for LACV infection in West Virginia from 2003 to 2007, using two forward stepwise discriminant analyses. The discriminant analyses were used to evaluate a number of demographic and socioeconomic ... | 2011 | 21980533 |
| la crosse virus field detection and vector competence of culex mosquitoes. | la crosse virus (lacv), a leading cause of arboviral pediatric encephalitis in the united states, is emerging in appalachia. here, we report field and laboratory evidence that suggest lacv may be using culex mosquitoes as additional vectors in this region. this bunyavirus was detected by reverse-transcriptase polymerase chain reaction in two pools of culex mosquitoes in southwestern virginia and in six pools in west virginia. to assess vector competence, we offered lacv blood meals to field-coll ... | 2015 | 26175029 |