Molecular analysis of West Nile virus (WNV) isolates obtained during a 2010 outbreak in Maricopa County, Arizona, USA, demonstrated co-circulation of 3 distinct genetic variants, including strains with novel envelope protein mutations. These results highlight the continuing evolution of WNV in North America and the current complexity of WNV dispersal and transmission.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3901498 | PMC |
| http://dx.doi.org/10.3201/eid2002.131008 | DOI Listing |
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