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Volume 9, Number 12—December 2003

Dispatch

West Nile Virus in Mexico: Evidence of Widespread Circulation since July 2002.

José G. Estrada-Franco*, Roberto Navarro-Lopez†, David W.C. Beasley*, Lark L. Coffey*, Anne-Sophie Carrara*, Amelia Travassos da Rosa*, Tamara Clements‡, Eryu Wang*, George V. Ludwig‡, Arturo Campomanes Cortes†, Pedro Paz Ramirez†, Robert B. Tesh*, Alan D.T. Barrett*, and Scott C. Weaver*Comments to Author 
Author affiliations: *University of Texas Medical Branch, Galveston, Texas, USA; †Comision Mexico-Estados Unidos para la Prevencion de la Fiebre Aftosa y Otras Enfermedades Exoticas de los Animales, Mexico City, Mexico; ‡U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, USA

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Table 1

Serologic analysisa of 22 horse serum samples from five Mexican states, positive for West Nile virus antibodies, July 2002–March 2003b

WNV serologic findings HI SLEV
State, locality
Sample no.
Date
Age
Sex
IgG-E
IgM
IgG
PRNT
HI

Veracruz, Minatitlan
VER-015
Oct 28, 2002
7 y
M
pos
1,600
400
>320
20
20
Veracruz, Minatitlan
VER-011
Oct 28, 2002
18 m
M
pos
neg
400
>320
160
neg
Veracruz, Hidalgotitlan
VER-017
Oct 29, 2002
8 m
M
pos
12,800
neg
>320
>640
160
Veracruz, Texistepec
VER-26
Oct 29, 2002
2 y
M
pos
neg
100
40
160
neg
Veracruz, Texistepec
VER-025
Nov 7, 2002
18 m
M
pos
6,400
neg
>320
>640
160
Veracruz, J. Carranza
VER-036
Nov 11, 2002
7 m
M
pos
neg
6,400
>320
>640
40
Veracruz, Angel R Cabada
406
Mar 20, 2003
13 m
F
pos
neg
400
>320
80
neg
Veracruz, Cosamaloapan
187
Aug 28, 2002
5 y
F
pos
neg
1,600
>320
160
20
Yucatan, Merida
389
Mar 7, 2003
4 y
F
pos
neg
1,600
nt
80
20
Yucatan, Tizimin
391
Mar 1, 2003
5 y
M
pos
neg
1,600
160
40
20
Chihuahua, Ojinaga
210
Oct 20, 2002
2 y
M
neg
1,600
neg
40
320
40
Coahuila, Cd Acuna
112
Oct 14, 2002
3 y
M
pos
1,600
neg
80
20
20
Coahuila, Hidalgo
4
Sep 1, 2002
5
F
pos
400
100
>320
>640
20
Coahuila, Villa Union
26
Nov 2, 2002
4 y
M
pos
400
100
>320
320
80
Coahuila, Nava
67
Jul 11, 2002
7 y
M
pos
400
100
>320
320
20
Coahuila, P. Negras
56
Nov 5, 2002
2 y
M
pos
6,400
100
>320
>640
40
Coahuila, Zaragoza
39
Oct 10, 2002
5 y
F
pos
neg
400
>160
320
20
Coahuila, Morelos
51
Oct 5, 2002
7 y
M
pos
neg
100
>160
160
40
Tamaulipas, Diaz Ordaz
268
Nov 7, 2002
8 y
F
pos
12,800
1,600
40
320
40
Tamaulipas, Camargo
279
Nov 11, 2002
4 y
F
pos
12,800
3,200
>320
320
80
Tamaulipas, Rio Bravo
349
Nov 5, 2002
8 y
M
pos
neg
400
80
80
neg
Tamaulipas, Victoria 344 Nov 7, 2002 2 y M pos neg 6,400 >320 160 20

aTiters expressed as reciprocal of dilution; all tests were enzyme-linked immunosorbent assays unless otherwise noted; all tests were against WNV (West Nile virus) unless otherwise noted. bSLEV, St. Louis encephalitis virus; Ig, immunoglobin; G-E, recombinant domain III of E protein; PRNT, plaque reduction neutralization test; HI, hemagglutination inhibition test.

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