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Volume 14, Number 4—April 2008

Letter

West Nile Virus in Birds, Argentina

Luis Adrián Diaz*Comments to Author , Nicholas Komar†, Andres Visintin*, María Julia Dantur Juri‡, Marina Stein§, Rebeca Lobo Allende‡, Lorena Spinsanti*, Brenda Konigheim*, Javier Aguilar*, Magdalena Laurito*, Walter Almirón*, and Marta Contigiani*
Author affiliations: *Universidad Nacional de Córdoba, Córdoba City, Argentina; †Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; ‡Universidad Nacional de Tucumán, Tucumán, Argentina; §Universidad Nacional del Noreste, Chaco, Argentina;

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Table

Prevalence of West Nile virus–neutralizing antibodies among birds grouped by taxonomic family, sampled in Chaco, Córdoba, and Tucumán Provinces, Argentina, 2004–2006*

Bird family No. positive No. tested % Positive (95% CI) Range of PRNT80 titer†
Cardinalidae 2 54 3.7 (1.0–12.5) 80–160
Columbidae 4 270 1.5 (0.6–3.8) 80–1,280
Dendrocolaptidae 4 17 23.5 (9.6–47.3) 320–2,560
Falconidae 3 5 60.0 (23.1–88.2) 320–2,560
Furnariidae 12 201 6.0 (3.4–10.1) 80–1,280
Icteridae 3 137 2.2 (0.7–6.2) 40–320
Passeridae 1 87 1.1 (0.2–6.2) 40
Phasianidae 2 8 25.0 (7.1–59.1) 320
Polioptilidae 2 7 28.6 (8.2–64.1) 80–640
Troglodytidae 1 17 5.9 (1.0–27.0) 80
Turdidae 8 132 6.1 (3.1–11.5) 40–1,280
Tyrannidae 1 370 0.3 (0.05–1.5) 160

*Most of these families are of the order Passeriformes except for Falconidae (Falconiformes), Phasianidae (Galliformes), and Columbidae (Columbiformes). CI, confidence internal, determined by the Wilson score method for binomial proportions, without continuity correction.
†PRNT, plaque-reduction neutralization test. Titers are expressed as inverse of dilution.

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