bunyavirus isolations from mosquitoes in the western canadian arctic.strains of california encephalitis virus (snowshoe hare subtype) were isolated from 8 of 475 pools comprising 23 747 unengorged female mosquitoes of five species collected at three of six locations throughout the mackenzie valley of the northwest territories, canada, from latitudes 60 to 69 degrees n between 10 and 24 july 1976. minimum field infection rates included 1:2734 for aedes communis, 1:256 to 1:3662 for a. hexodontus and 1:911 to 1:1611 for a. punctor. northway virus was also isolated ...197718541
bunyavirus development in arctic and aedes aegypti mosquitoes as revealed by glucose oxidase staining and immunofluorescence.northway virus replication has been detected in salivary glands of wild-caught culiseta inornata and aedes communis mosquitoes from the western canadian arctic after incubation at 4 degrees c for 9 to 11 months, and after incubation at 13 degrees c for 3 to 4 months after they received virus by oral ingestion or intrathoracic injection. aedes hexodontus supported northway virus replication after incubation at 13 degrees c for one month after intrathoracic injection. aedes aegypti supported north ...197944464
northway virus: a new bunyamwera group arbovirus from alaska. 19744150818
monitoring sheep and culicoides midges in montana for evidence of bunyamwera serogroup virus infection.a serological and entomological investigation was performed to monitor for potential bunyamwera (bun) serogroup virus activity in montana.201426392881
sequence and phylogenetic data indicate that an orthobunyavirus recently detected in the yucatan peninsula of mexico is a novel reassortant of potosi and cache valley viruses.we determined the complete nucleotide sequences of the small (s) and medium (m) rna segments of an orthobunyavirus isolated from mosquitoes in the yucatan peninsula of mexico. a 528-nt region of the large (l) rna segment was also sequenced. the s rna segment has greatest nucleotide identity to the homologous region of cache valley virus (cvv; 98%) followed by potosi virus (potv; 89%) and northway virus (86%). the m rna segment has 96% nucleotide identity to the homologous region of potv, and les ...201222407405
management factors associated with operation-level prevalence of antibodies to cache valley virus and other bunyamwera serogroup viruses in sheep in the united states.a cross-sectional study was performed to identify operation-level risk factors associated with prevalence of antibody to bunyamwera (bun) serogroup viruses in sheep in the united states. sera were obtained from 5150 sheep in 270 operations located in 22 states (three in the west, nine central states, and 10 in the east) and tested at a dilution of 1:20 by a plaque reduction neutralization test (prnt) using cache valley virus (cvv). antibodies that neutralized cvv were identified in 1455 (28%) sh ...201526565774
vector competence of selected mosquito species (diptera: culicidae) for california strains of northway virus (bunyaviridae: bunyavirus).selected mosquito species from central valley, coastal, and alpine habitats of california were evaluated for their vector competence for northway (nor) virus. culiseta incidens thomson, culiseta inornata (williston), and anopheles freeborni aitken were the only competent vectors when fed virus. aedes sierrensis (ludlow), as well as alpine snow pool aedes (i.e., ae. cataphylla dyar, ae. hexodontus dyar, ae. increpitus dyar and ae. tahoensis dyar), ae. melanimon dyar, ae. washinoi lanzaro & eldrid ...19938099625
prevalence of neutralizing antibodies against california and bunyamwera serogroup viruses in deer from mountainous areas of california.plaque reduction-serum dilution neutralization was used to evaluate the status of bunyavirus activity in deer in mountainous areas of california. antibodies against 9 bunyaviruses were measured in 337 mule deer (odocoileus hemionus hemionus, o. hemionus californicus, and o. hemionus inyoensis) and black-tailed deer (o. hemionus columbianus). more deer from high mountainous areas had neutralizing antibodies against jamestown canyon virus than did deer from low mountainous areas (23% vs. 9%; p les ...19892496610
distribution of neutralizing antibodies to california and bunyamwera serogroup viruses in horses and rodents in california.neutralization tests were done on sera from 141 horses from high elevation regions of california. antibody prevalences to jamestown canyon, snowshoe hare, and california encephalitis viruses in the california serogroup and northway virus in the bunyamwera serogroup were 55%, 43%, 18%, and 46%, respectively. in 51 horses from rural low elevation regions, seroprevalences were 31%, 35%, 35%, and 37%, respectively. twenty-four horses from a suburban lowland area were seronegative, except for a singl ...19902107770
antibodies to arboviruses in an alaskan population at occupational risk of infection.a total of 435 united states geological survey and united states forest service workers in alaska were studied for serologic evidence of past infections with four arboviruses known or suspected to be human pathogens. of the personnel tested, 36 (8.3%) had the neutralizing antibody to jamestown canyon but not snowshoe hare virus, 6 (1.4%) had the antibody to snowshoe hare but not jamestown canyon virus, 53 (12.2%) had the antibody to both viruses, 17 (3.9%) had the antibody to northway virus, and ...19883208197
mosquito-borne arboviruses in arctic america.mosquito-borne arboviruses are prevalent throughout subarctic regions of canada and alaska, principally in the boreal forest extending between latitudes 53 and 66 degrees n, but they have been identified in tundra regions as far north as 70 degrees n. all mosquito-borne agents have been bunyaviruses, comprising principally the snowshoe hare subtype of california encephalitis (ce) virus, but also northway virus. mosquito vectors comprise several aedes species and culiseta inornata, all of which h ...19751602
transmission of northway and st. louis encephalitis viruses by arctic mosquitoes.transmission of a canadian arctic isolate of northway virus has been demonstrated after incubation of arctic aedes communis mosquitoes at 13 degrees c for 27 days after intrathoracic injection of 300 plaque forming units of virus. replication has also been demonstrated after intrathoracic injection of domestic a. aegypti mosquitoes of this virus. virions of northway virus, 84--92 nm diameter were morphologically typical of a bunyavirus after propagation in salivary glands of a. communis or in ti ...1978687117
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