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Volume 10, Number 12—December 2004


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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Table 3

Cross-neutralization immune response of American Crows at 14 days postinfection with either KEN or KUN viruses

Sample no. Inoculation NY99 KEN KUN Difference
Crow 8 KEN 640a 640b NT 0
Crow 1 KUN 80 NTc 160 2-fold
Crow 2 KUN 80 NT 80 0
Crow 3 KUN 160 NT 320 2-fold
Crow 4 KUN 40 NT 80 2-fold
Crow 5 KUN 40 NT 40 0
Crow 6 KUN 20 NT 20 0
Crow 7 KUN 80 NT 80 0
Crow 8 KUN 80 NT 160 2-fold

aValues represent the greatest reciprocal dilution in which ≥90% plaque inhibition was achieved as compared to sera-negative control cultures.
bHomologous titers are depicted in bold print.
cNT, not tested; KEN, West Nile virus strain from Kenya; KUN (Kunjin), West Nile virus strain from Australia.

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