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Volume 11, Number 9—September 2005
Letter

West Nile Virus Antibodies in Colombian Horses

Salim Mattar*, Eric Edwards†, Jose Laguado*, Marco González*, Jaime Alvarez*, and Nicholas Komar†Comments to Author 
Author affiliations: *University of Córdoba, Montería, Córdoba, Colombia; †Centers for Disease Control and Prevention, Fort Collins, Colorado, USA

Main Article

Table

PRNT90 antibody titers to WNV and other South American flaviviruses for Colombian equine sera*†

Equine ID‡ Department Age (y) WNV SLEV ILHV ROCV BSQV
3 Córdoba 4 1:40 <1:10 <1:10 <1:10 <1:10
35 Córdoba 5 1:160 <1:10 <1:10 <1:10 <1:10
39§ Córdoba 4 1:40 <1:10 <1:10 <1:10 <1:10
41 Córdoba 6 1:40 <1:10 <1:10 <1:10 <1:10
48 Córdoba 4 1:640 <1:10 <1:10 <1:10 <1:10
76 Sucre 5 1:80 <1:10 <1:10 <1:10 <1:10
85 Sucre 9 1:80 <1:10 <1:10 <1:10 <1:10
94 Sucre 3 1:40 <1:10 <1:10 <1:10 <1:10
101 Sucre 4 1:40 <1:10 <1:10 <1:10 <1:10
109§ Sucre 7 1:160 1:40 1:40 1:10 <1:10
123 Córdoba 6 1:40 <1:10 <1:10 <1:10 <1:10
125 Córdoba 4 1:160 <1:10 <1:10 <1:10 <1:10

*These 12 specimens were considered positive for WNV infection; a 4-fold WNV PRNT90 titer compared to that of other flaviviruses was required for a positive determination of previous WNV infection.
†PRNT90, 90% plaque reduction neutralization test; WNV, West Nile virus; SLEV, Saint Louis encephalitis virus (South American strain); ILHV, Ilhéus virus; ROCV, Rocio virus; BSQV, Bussuquara virus.
‡All equines were horses except for 76 and 85, which were donkeys.
§Also positive for anti-WNV immunoglobulin M by antibody-capture enzyme-linked immunosorbent assay.

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