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Volume 10, Number 12—December 2004

Research

Differential Virulence of West Nile Strains for American Crows

Aaron C. Brault*†Comments to Author , Stanley A. Langevin*, Richard A. Bowen‡, Nicholas A. Panella*, Brad J. Biggerstaff*, Barry R. Miller*, and Nicholas Komar*
Author affiliations: *Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; †University of California, Davis, California, USA; ‡Colorado State University, Fort Collins, Colorado, USA

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Figure 4

Viremia production of American Crows previously immunized with West Nile virus (WNV)-KUN or WNV-KEN viruses after injection with 3.2 log10 PFU of NY99 WNV. No detectable levels of viremia (>1.7 log10 PFU/mL crow serum) developed in the KUN virus–immunized crows (0/8). Data points for the naïve (unexposed to WNV) crows challenged with the NY99 virus represent the mean of three samples chosen randomly. Bars represent standard deviations (SD) of the mean. hd, high dose; PRNT, plaque reduction ne

Figure 4. Viremia production of American Crows previously immunized with West Nile virus (WNV)-KUN or WNV-KEN viruses after injection with 3.2 log10 PFU of NY99 WNV. No detectable levels of viremia (>1.7 log10 PFU/mL crow serum) developed in the KUN virus–immunized crows (0/8). Data points for the naïve (unexposed to WNV) crows challenged with the NY99 virus represent the mean of three samples chosen randomly. Bars represent standard deviations (SD) of the mean. hd, high dose; PRNT, plaque reduction neutralization assay.

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