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Volume 11, Number 11—November 2005
Synopsis

Highly Pathogenic Avian Influenza H5N1, Thailand, 2004

Thanawat Tiensin*†Comments to Author , Prasit Chaitaweesub*, Thaweesak Songserm‡, Arunee Chaisingh§, Wirongrong Hoonsuwan*, Chantanee Buranathai*, Tippawon Parakamawongsa*, Sith Premashthira*, Alongkorn Amonsin¶, Marius Gilbert#, Mirjam Nielen†, and Arjan Stegeman†
Author affiliations: *Department of Livestock Development, Bangkok, Thailand; †Utrecht University, Utrecht, the Netherlands; ‡Kasetsart University, Nakhon Pathom, Thailand; §National Institute of Animal Health, Bangkok, Thailand; ¶Chulalongkorn University, Bangkok, Thailand; #Free University of Brussels, Brussels, Belgium

Main Article

Table 1

Poultry population categorized by geographic region in Thailand in 2003

Poultry population North Central East South Northeast Total RR (95% CI)*
Backyard chickens
Birds 18,067,529 9,312,042 3,880,535 6,280,375 25,551,093 63,091,574
Flocks 543,793 143,829 81,804 241,886 1,125,352 2,136,664
Infected flocks 491 296 107 31 94 1,019
Incidence, % 0.0903 0.2058 0.1308 0.0128 0.0084 0.0477 1.0
Layers
Birds 2,288,485 7,682,667 8,304,081 2,113,035 3,924,255 24,312,523
Flocks 4,209 6,396 3,941 7,666 14,264 36,476
Infected flocks 29 42 14 1 6 92
Incidence, % 0.6890 0.6567 0.3552 0.0130 0.0421 0.2522 5.3 (4.4–6.4)
Broilers
Birds 12,442,797 70,414,281 53,681,571 6,565,161 22,210,976 165,314,786
Flocks 4,588 6,242 6,507 6,166 22,274 45,777
Infected flocks 44 54 8 3 2 111
Incidence, %
 0.9590
 0.8651
 0.1229
 0.0487
 0.0090
 0.2425
 5.1 (4.3–6.1)
Ducks
Birds 2,567,666 8,026,701 6,110,934 1,777,466 5,317,325 23,800,092
Flocks 58,606 33,607 17,917 95,216 478,483 683,829
Infected flocks 85 355 29 9 13 491
Incidence, % 0.1450 1.0563 0.1619 0.0095 0.0027 0.0718 1.5 (1.3–1.7)
Quails
Birds 199,357 2,920,216 189,342 302,291 81,597 3,692,803
Flocks 147 324 114 1,797 211 2,593
Infected flocks 12 26 – 1 1 40
Incidence, % 8.1633 8.0247 0 0.0556 0.4739 1.5426 32.4 (26.5–39.5)
Geese
Birds 8,098 154,723 101,465 9,980 34,401 308,667
Flocks 1,650 1,870 923 2,596 7,646 14,685
Infected flocks 4 8 3 – 1 16
Incidence, % 0.2424 0.4278 0.3250 0 0.0131 0.1090 2.3 (1.4–3.7)
Other
Infected flocks
 10
 14
 6
 –
 10
 40
Total
Birds 35,573,932 98,510,630 72,267,928 17,048,308 57,119,647 280,520,445
Flocks† 612,993 192,268 111,206 355,327 1,648,230 2,920,024
Infected flocks‡ 665 781 161 45 117 1,769
Incidence, % 0.1085 0.4062 0.1448 0.0127 0.0071 0.0606
RR (95% CI) 1.0 3.7 (3.4–4.1) 1.3 (1.1–1.6) 0.1 (0.01–0.15) 0.05 (0.06–0.08)

*Relationship between cumulative incidence and relative risk (RR) of influenza H5N1 epidemic. Cumulative incidence of infected flocks of backyard chickens and the Central Region were assigned an RR of 1.0.
†Included only the number of flocks of backyard chickens, layers, broilers, ducks, quails, and geese. Some flocks are mixed types of poultry on site.
‡Included only the number of infected flocks of backyard chickens, layers, broilers, ducks, quails, and geese.

Main Article

Page created: February 17, 2012
Page updated: February 17, 2012
Page reviewed: February 17, 2012
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