Emerging Infectious Disease ISSN: 1080-6059

Genetic Variability of West Nile Virus in US Blood Donors, 2002–2005

Andriyan Grinev*, Sylvester Daniel*, Susan Stramer†, Susan Rossmann‡, Sally Caglioti§, and Maria Rios*

Author affiliations: *Food and Drug Administration, Bethesda, Maryland, USA; †American Red Cross, Gaithersburg, Maryland, USA; ‡Gulf Coast Regional Blood Center, Houston, Texas, USA; §Blood System Laboratories, Tempe, Arizona, USA;

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Figure 1

Phylogenetic analyses based on maximum parsimony comparing the 2,685-bp nucleotide sequence, including the complete structural and the 5′-untranslated region of prototype West Nile virus (WNV) strain WN-NY99 with 30 WNV isolates collected during the 2002–2005 epidemics in the United States. Values in parentheses show percentage of nucleotide sequence divergence from WN-NY99. Scale bar represents a 1-nt change.

Figure 1. Phylogenetic analyses based on maximum parsimony comparing the 2,685-bp nucleotide sequence, including the complete structural and the 5′-untranslated region of prototype West Nile virus (WNV) strain WN-NY99 with 30 WNV isolates collected during the 2002–2005 epidemics in the United States. Values in parentheses show percentage of nucleotide sequence divergence from WN-NY99. Scale bar represents a 1-nt change.

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