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Highly pathogenic avian influenza H5N1, Thailand, 2004.

Tiensin T, Chaitaweesub P, Songserm T, Chaisingh A, Hoonsuwan W, Buranathai C, Parakamawongsa T, Premashthira S, Amonsin A, Gilbert M, Nielen M, Stegeman A - Emerging Infect. Dis. (2005)

Bottom Line: A total of 83% of infected flocks confirmed by laboratories were backyard chickens (56%) or ducks (27%).More than 62 million birds were either killed by HPAI viruses or culled.In 2005, the epidemic is ongoing in Thailand.

View Article: PubMed Central - PubMed

Affiliation: Department of Livestock Development, 69/1 Phaya Thai Road, Ratchathewee, Bangkok, Thailand. ttiensin@gmail.com

ABSTRACT
In January 2004, highly pathogenic avian influenza (HPAI) virus of the H5N1 subtype was first confirmed in poultry and humans in Thailand. Control measures, e.g., culling poultry flocks, restricting poultry movement, and improving hygiene, were implemented. Poultry populations in 1,417 villages in 60 of 76 provinces were affected in 2004. A total of 83% of infected flocks confirmed by laboratories were backyard chickens (56%) or ducks (27%). Outbreaks were concentrated in the Central, the southern part of the Northern, and Eastern Regions of Thailand, which are wetlands, water reservoirs, and dense poultry areas. More than 62 million birds were either killed by HPAI viruses or culled. H5N1 virus from poultry caused 17 human cases and 12 deaths in Thailand; a number of domestic cats, captive tigers, and leopards also died of the H5N1 virus. In 2005, the epidemic is ongoing in Thailand.

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Related in: MedlinePlus

Infected flocks by day of detection and type of poultry, January–May 2004 (panels with "-1" suffix) and July–December 2004 (panels with "-2" suffix). A) Backyard chickens. B) Ducks. C) Broilers. D) Layers.
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Figure 4: Infected flocks by day of detection and type of poultry, January–May 2004 (panels with "-1" suffix) and July–December 2004 (panels with "-2" suffix). A) Backyard chickens. B) Ducks. C) Broilers. D) Layers.

Mentions: The geographic distribution of the second wave differs markedly from that of the first wave, and the number of confirmed outbreaks was 8 times higher. Most HPAI outbreaks were found in the Central and Northern Regions where chicken and duck flocks are relatively more abundant. In the Northern Region, 99% of infected flocks were detected in the southern part. Figure 3 shows that HPAI was sporadic in the Southern, the northern part of the Northern, and the Northeastern Regions, which have a lower number and density of poultry populations. Figure 2 shows a dramatic increase in HPAI-positive flocks in January and October 2004, which coincided with the nationwide surveillance programs implemented at that time. Also, the number of infected flocks, particularly of backyard chickens and ducks, increased markedly in these months (Figure 4).


Highly pathogenic avian influenza H5N1, Thailand, 2004.

Tiensin T, Chaitaweesub P, Songserm T, Chaisingh A, Hoonsuwan W, Buranathai C, Parakamawongsa T, Premashthira S, Amonsin A, Gilbert M, Nielen M, Stegeman A - Emerging Infect. Dis. (2005)

Infected flocks by day of detection and type of poultry, January–May 2004 (panels with "-1" suffix) and July–December 2004 (panels with "-2" suffix). A) Backyard chickens. B) Ducks. C) Broilers. D) Layers.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3367332&req=5

Figure 4: Infected flocks by day of detection and type of poultry, January–May 2004 (panels with "-1" suffix) and July–December 2004 (panels with "-2" suffix). A) Backyard chickens. B) Ducks. C) Broilers. D) Layers.
Mentions: The geographic distribution of the second wave differs markedly from that of the first wave, and the number of confirmed outbreaks was 8 times higher. Most HPAI outbreaks were found in the Central and Northern Regions where chicken and duck flocks are relatively more abundant. In the Northern Region, 99% of infected flocks were detected in the southern part. Figure 3 shows that HPAI was sporadic in the Southern, the northern part of the Northern, and the Northeastern Regions, which have a lower number and density of poultry populations. Figure 2 shows a dramatic increase in HPAI-positive flocks in January and October 2004, which coincided with the nationwide surveillance programs implemented at that time. Also, the number of infected flocks, particularly of backyard chickens and ducks, increased markedly in these months (Figure 4).

Bottom Line: A total of 83% of infected flocks confirmed by laboratories were backyard chickens (56%) or ducks (27%).More than 62 million birds were either killed by HPAI viruses or culled.In 2005, the epidemic is ongoing in Thailand.

View Article: PubMed Central - PubMed

Affiliation: Department of Livestock Development, 69/1 Phaya Thai Road, Ratchathewee, Bangkok, Thailand. ttiensin@gmail.com

ABSTRACT
In January 2004, highly pathogenic avian influenza (HPAI) virus of the H5N1 subtype was first confirmed in poultry and humans in Thailand. Control measures, e.g., culling poultry flocks, restricting poultry movement, and improving hygiene, were implemented. Poultry populations in 1,417 villages in 60 of 76 provinces were affected in 2004. A total of 83% of infected flocks confirmed by laboratories were backyard chickens (56%) or ducks (27%). Outbreaks were concentrated in the Central, the southern part of the Northern, and Eastern Regions of Thailand, which are wetlands, water reservoirs, and dense poultry areas. More than 62 million birds were either killed by HPAI viruses or culled. H5N1 virus from poultry caused 17 human cases and 12 deaths in Thailand; a number of domestic cats, captive tigers, and leopards also died of the H5N1 virus. In 2005, the epidemic is ongoing in Thailand.

Show MeSH
Related in: MedlinePlus