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Volume 17, Number 6—June 2011

Research

Wild Birds and Increased Transmission of Highly Pathogenic Avian Influenza (H5N1) among Poultry, Thailand

Juthatip Keawcharoen, Jan van den Broek, Annemarie Bouma, Thanawat Tiensin, Albert D.M.E Osterhaus, and Hans HeesterbeekComments to Author 
Author affiliations: Author affiliations: Erasmus Medical Center, Rotterdam, the Netherlands (J. Keawcharoen, A.D.M.E. Osterhaus); Utrecht University, Utrecht, the Netherlands (J. van den Broek, A. Bouma, T. Tiensin, H. Heesterbeek)

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Table A3

Prevalence of highly pathogenic avian influenza (H5N1) infection in wild birds, 2004–2007, Thailand *

Characteristic No. infected birds No. tested birds Prevalence, % (95% CI)
Type of bird
Migratory 4 2,142 0.187 (0.01–0.21)
Resident 138 16,633 0.829 (0.66–0.94)
Breeding visitor
50
6,143
0.814 (0.61–0.99)
Regions
North 13 5,321 0.24 (0.1–0.3)
Central-Northwest 77 4,510 1.71 (1.38–2.02)
Central-North 30 4,075 0.74 (0.49–0.91)
Central-Central 54 5,327 1.01 (0.78–1.22)
Central-East 1 1,462 0.07 (0.02–0.32)
Central-Southeast 21 2,083 1.01 (0.64–1.36)
Central-Southwest 3 1,713 0.18 (0–0.23)
Northeast 5 2,298 0.22 (0.05–0.35)
South
8
2,348
0.34 (0.11–0.49)
Seasons, y
Winter (January –February), 2004 29 366 7.92 (5.8–10.4)
Summer (March–June), 2004 27 229 11.79 (8.7–15.8)
Rainy (July–October), 2004 9 359 2.51 (1.51–4.32)
Winter (November–December), 2004 and (January–February), 2005 19 1,027 1.85 (1.29–2.70)
Summer (March–June), 2005 12 611 1.96 (1.26–3.15)
Rainy (July–October), 2005 25 8,026 0.31 (0.22–0.43)
Winter (November–December), 2005 and (January–February ), 2006 19 1,317 1.44 (1.00–2.10)
Summer (March–June), 2006 7 3,768 0.19 (0.11–0.32)
Rainy (July–October), 2006 17 4,528 0.38 (0.25–0.56)
Winter (November–December), 2006 and (January–February), 2007 44 3,261 1.35 (1.06–1.73)
Summer (March–June), 2007 4 3,032 0.13 (0.06–0.30)
Rainy (July–October), 2007 0 2,338 NA
Winter (November–December), 2007 0 652 NA

*CI, confidence interval; NA, not applicable.

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