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Volume 9, Number 7—July 2003

Dispatch

Serologic Evidence of West Nile Virus Infection in Horses, Coahuila State, Mexico

Bradley J. Blitvich*, Ildefonso Fernandez-Salas†, Juan F. Contreras-Cordero†, Nicole L. Marlenee*, Jose I. Gonzalez-Rojas†, Nicholas Komar‡, Duane J. Gubler‡, Charles H. Calisher*, and Barry J. Beaty*Comments to Author 
Author affiliations: *Colorado State University, Fort Collins, Colorado, USA; †Universidad Autonoma de Nuevo Leon, Nuevo Leon, Mexico; ‡Centers for Disease Control and Prevention, Fort Collins, Colorado, USA

Main Article

Table

Summary of serologic data for horses in Coahuila State, Mexicoa

Horse Study site Clinical illness % inhibition by ELISAb cPRNT90 titer
PRNT diagnosis
WNV SLEV
H-1
Ciudad Acuña
No
90
>320
—d
WNV
H-2
Ciudad Acuña
No
5


Negative
H-3
Ciudad Acuña
No
0


Negative
H-4
Ciudad Acuña
No
0


Negative
H-5
Ciudad Acuña
No
90
>320
40
WNV
H-6
Ciudad Acuña
No
93
>320

WNV
H-7
Ciudad Acuña
No
93
>320

WNV
H-8
Ciudad Acuña
Yes
93
>320

WNV
H-9
Ciudad Acuña
Yes
86
>320

WNV
H-10
Ciudad Acuña
Yes
90
>320
20
WNV
H-11
Ciudad Acuña
No
89
>320

WNV
H-12
Ciudad Acuña
No
92
>320
20
WNV
H-13
Ciudad Acuña
Yes
91
>320

WNV
H-14
Ciudad Acuña
Yes
78
>320
20
WNV
H-15
Jiménez
No
82
>320

WNV
H-16
Jiménez
No
25
40

WNV
H-17
Jiménez
No
7


Negative
H-18
Jiménez
No
93
>320
20
WNV
H-19
Jiménez
No
0
20
20
Flavivirus
H-20
Jiménez
No
47
40

WNV
H-21
Saltillo
No
9


Negative
H-22
Saltillo
No
15


Negative
H-23
Saltillo
No
12


Negative
H-24 Saltillo No 11 Negative

aELISA, enzyme-linked immunosorbent assay; PRNT, plaque reduction neutralization test; WNV, West Nile virus; SLEV, Saint Louis encephalitis virus.
bInhibition values >30% are considered significant.
cNeutralizing antibodies to WNV in selected horse serum samples were confirmed at Centers for Disease Control and Prevention-Division of Viral and Bacterial Infectious Diseases by PRNT.
d—, <20.

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