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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 4

Cross-neutralization immune response of American Crows 24 days postinfection (dpi) with either KEN or KUN virusesa

Sample no. Inoculation NY99 KEN KUN Difference
Crow 8 KEN 640b 640c NT 0
Crow 1 KUN 160 NTd 320 2-fold
Crow 2 KUN 320 NT 320 0
Crow 3 KUN 160 NT 160 0
Crow-4 KUN 160 NT 320 2-fold
Crow 5 KUN 160 NT 160 0
Crow 6 KUN 320 NT 320 0
Crow-7 KUN 640 NT 640 0
Crow 8 KUN 640 NT 640 0

aFollowing secondary NY99 challenge at 14 dpi.
bValues represent the greatest reciprocal dilution in which >90% plaque inhibition was achieved as compared to sera-negative control cultures.
cHomologous titers are depicted in bold print.
dNT, not tested; KEN, West Nile virus strain from Kenya; KUN (Kunjin), West Nile virus strain from Australia.

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