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Volume 17, Number 12—December 2011
Research

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)

Main Article

Table 3

Tissue tropism and viral loads in birds that died after experimental inoculation with WNV, Mexico*

Species† WNV strain dpi Viral load by tissue type, PFU/0.5 cm3
Brain Heart Spleen Kidney Lung Liver Pancreas Intestine Skin
House sparrow Tecate 4 8.0 7.6 NR NR 9.3 8.1 4.9 <0.7 7.6
Tecate 5 8.2 7.7 7.6 7.2 9.2 8.0 5.2 3.1 8.0
Tabasco 6 2.3 2.9 NR 3.6 4.5 5.7 <0.7 <0.7 4.9
Tabasco 7 <0.7 <0.7 <0.7 1.3 1.9 <0.7 <0.7 <0.7 <0.7
Tabasco 7 3.1 7.7 4.8 5.9 5.2 5.2 <0.7 NR NR
Great-tailed grackle Tecate 4 7.4 8.2 7.5 8.8 9.3 7.6 6.7 <0.7 8.0
Tecate 12 3.4 5.1 5.5 5.9 5.2 5.8 6.0 3.0 4.9
Tabasco 3 NR 8.1 3.8 8.6 8.5 7.9 <0.7 NR NR
Tabasco 4 8.1 7.7 6.6 7.9 NR 7.4 4.7 2.7 7.8

*WNV, West Nile virus; dpi, days postinoculation; NR, not reported because of insufficient sample collection.
†Deaths occurred in sparrows and grackles but not thrushes and chickens; thrushes and chickens were euthanized on 21 and 7 dpi, respectively, and tissues from these birds were negative for infectious WNV with the exception of 1 chicken-derived skin sample (102.0 PFU/0.5 cm3).

Main Article

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

Page created: November 30, 2011
Page updated: November 30, 2011
Page reviewed: November 30, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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