Volume 44, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Eight previously untyped Bunyamwera serogroup bunyaviruses that had been isolated from mosquitoes collected in California and Oregon between 1969 and 1985, were identified by cross-neutralization tests. Four viruses from and a virus from collected in Butte County in the Central Valley of California in 1970–71 were shown to belong to the Northway serotype. The existence of a Northway serotype virus in California had been inferred from previous serologic surveys of deer and horses, but these are the first Northway serotype viruses to be identified from the contiguous United States or from . This is also the first isolation of any virus from . Two viruses from collected in Umatilla County, Oregon in 1969 may represent a new serotype in the Bunyamwera serocomplex of the Bunyamwera serogroup. The name “Stanfield” is proposed for this serotype, which is closely related to the Cache Valley and Northway bunyavirus serotypes. A virus from collected in San Diego County, California in 1985 was confirmed to belong to the Main Drain serotype. Previously, Main Drain serotype viruses in California have been associated principally with .


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