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Volume 17, Number 12—December 2011


West Nile Virus Infection of Birds, Mexico

Sergio Guerrero-Sánchez1, Sandra Cuevas-Romero, Nicole M. Nemeth, Maríaresa Jesús Trujillo-Olivera, Gabriella Worwa, Alan Dupuis, Aaron C. Brault, Laura D. Kramer, Nicholas Komar, and José Guillermo Estrada-FrancoComments to Author 
Author affiliations: Zoológico Miguel Alvarez del Toro, Tuxtla Gutiérrez, Mexico (S. Guerrero-Sánchez); Instituto Nacional de Investigaciones Forestales, Mexico City, Mexico (S. Cuevas-Romero); Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (N.M. Nemeth, A.C. Brault, N. Komar); Universidad Autónoma de Chiapas, Tuxtla Gutiérrez (M.T. Jesus Trujillo-Olivera); University of California, Davis, California, USA (G. Worwa); New York State Department of Health, Slingerlands, New York, USA (A Dupuis, L.D. Kramer); University of Texas Medical Branch, Galveston, Texas, USA (J.G. Estrada-Franco)

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Table 2

Virus shedding by 2 bird species experimentally inoculated with West Nile virus from Mexico*

Species No. WNV strain Oral shedding
Cloacal shedding
Peak titer, log PFU/swab† When detected, dpi Proportion positive Peak titer, log PFU/swab† When detected, dpi Proportion positive
House sparrow 6 Tecate 5.0 2–7 1.00 1.4 2–3 0.83
6 Tabasco 7.2 2–6 0.67 4.9 4 NR
Great-tailed grackle 4 Tecate 3.7 2–7 0.75 2.4 3 0.75
4 Tabasco 6.2 5–6 0.75 4.6 3–7 NR

*dpi, days postinoculation; NR, not reported because of insufficient sample collection.
†Peak titers and end point of detection might be underestimated because of intermittent sample collection.

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1Current affiliation: El Colegio de la Frontera Sur, Campeche, Mexico.

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