Co-circulation of West Nile Virus Variants, Arizona, USA, 2010

Abstract

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.

Keywords

• West Nile virus
• viruses
• evolution
• co-circulation
• phylogenetics
• sequence variants