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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 1

Viremia parameters and reservoir competence index values for birds from Mexico infected with West Nile virus*

Species
 Tecate strain viremia
Tabasco strain viremia
No.
 Duration
(95% CI)†
 Infect
(95% CI)‡
 Mean
peak
(range)§
 Comp
(95% CI)¶
 No.
 Duration
(95% CI)†
 Infect (95% CI)‡
 Mean
peak
(range)§
 Comp
(95% CI)¶
House sparrow 6 3.3
(2.8–3.9) 0.34
(0.23–0.44) 9.4
(5.9–10.1) 1.12
(0.43–1.81) 6 2.3
(0.9–3.7) 0.27
(0.20–0.34) 7.7
(5.7–8.4) 0.62
(0.11–1.14)
Great-tailed grackle 4 4.5
(3.8–5.2) 0.28
(0.19–0.38) 9.7
(6.5–10.3) 1.28
(0.49–2.07) 4 4.2
(2.7–5.8) 0.47
(0.36–0.58) 9.8
(8.2–10.2) 2.01
(1.14–2.88)
Clay-colored thrush 4 1.5
(0.3–2.7) 0.12
(0.03–0.21) 6.3
(3.7–6.9) 0.18
(0.00–0.50) 4 0.5
(0.0–1.2) 0.03
(0.03–0.03) 4.3
(2.5–4.8) 0.01
(0.00–0.04)
Domestic chicken 9 0 0 2.9
(0–3.3)# 0.00 11 0 0 3.3
(0–4.1)# 0
Domestic pigeon 11 0 0 2.0
(1.8–2.2)# 0.00 9 0 0 3.4
(1.3–4.0)# 0

*Infect, infectiousness; comp, competence; CI, confidence interval.
†No. days that viremia titers were >104.7 PFU/mL serum for any given bird.
‡Average proportion of Culex quinquefasciatus mosquitoes that are expected to become infectious vectors after feeding on an infectious bird.
§Expressed as log PFU/mL.
¶Species-specific reservoir competence index. Values are calculated as the product of duration, infectiousness, and susceptibility to infection, which was 1.0 for all species in the table.
#Mean peak viremia values presented for chickens and pigeons may be underestimated because of intermittent sample collection.

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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