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Highly pathogenic avian influenza virus (H5N1) in domestic poultry and relationship with migratory birds, South Korea.

Lee YJ, Choi YK, Kim YJ, Song MS, Jeong OM, Lee EK, Jeon WJ, Jeong W, Joh SJ, Choi KS, Her M, Kim MC, Kim A, Kim MJ, Ho Lee E, Oh TG, Moon HJ, Yoo DW, Kim JH, Sung MH, Poo H, Kwon JH, Kim CJ - Emerging Infect. Dis. (2008)

Bottom Line: During the 2006-2007 winter season in South Korea, several outbreaks of highly pathogenic avian influenza virus (H5N1) were confirmed among domestic poultry and in migratory bird habitats.Phylogenetic analysis showed that all isolates were closely related and that all belong to the A/bar-headed goose/Qinghai/5/2005-like lineage rather than the A/chicken/Korea/ES/2003-like lineage.

View Article: PubMed Central - PubMed

Affiliation: Ministry of Agriculture and Forestry, Anyang, South Korea.

ABSTRACT
During the 2006-2007 winter season in South Korea, several outbreaks of highly pathogenic avian influenza virus (H5N1) were confirmed among domestic poultry and in migratory bird habitats. Phylogenetic analysis showed that all isolates were closely related and that all belong to the A/bar-headed goose/Qinghai/5/2005-like lineage rather than the A/chicken/Korea/ES/2003-like lineage.

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Related in: MedlinePlus

Location of highly pathogenic avian influenza (HPAI) virus (H5N1) outbreaks, South Korea, 2006–2007. Black box on inset shows area of enlargement. Red circle represents outbreaks in Jeollabuk-Do (first, second, and third outbreaks). Blue circle represents those in Chungcheongnam-Do (fourth and fifth outbreaks). Black oval represents regions in which HPAI virus (H5N1) isolates were isolated from migratory bird habitats during this study.
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Figure 1: Location of highly pathogenic avian influenza (HPAI) virus (H5N1) outbreaks, South Korea, 2006–2007. Black box on inset shows area of enlargement. Red circle represents outbreaks in Jeollabuk-Do (first, second, and third outbreaks). Blue circle represents those in Chungcheongnam-Do (fourth and fifth outbreaks). Black oval represents regions in which HPAI virus (H5N1) isolates were isolated from migratory bird habitats during this study.

Mentions: On December 21, 2006, the fourth outbreak of HPAI (H5N1) was confirmed in Asan, Chungcheongnam-Do, in breeder ducks that had shown a severe drop in egg production but no deaths. During intensive observation within the surveillance zone from the fourth outbreak farm, another HPAI (H5N1) outbreak was confirmed in Cheonan, Chungcheongnam-Do, on January 20, 2007, in a layer chicken farm with a 1% mortality rate (Figure 1). Compared with the rates in the first outbreak, the mortality rates in the more recent outbreaks were low (1%–4%) at notification time. This low proportion of deaths could be attributed to the early reporting system between the farmers and NVRQS, when the mortality rate reached ≈1% of the flock on poultry farms, and to the culling of flocks on reverse transcription–PCR confirmation (usually within 1 day) to prevent the spread of the disease. This could have limited the recorded observations when the infecting influenza virus was eliminated before the full extent of its pathogenicity could be manifested, usually after several days of infection.


Highly pathogenic avian influenza virus (H5N1) in domestic poultry and relationship with migratory birds, South Korea.

Lee YJ, Choi YK, Kim YJ, Song MS, Jeong OM, Lee EK, Jeon WJ, Jeong W, Joh SJ, Choi KS, Her M, Kim MC, Kim A, Kim MJ, Ho Lee E, Oh TG, Moon HJ, Yoo DW, Kim JH, Sung MH, Poo H, Kwon JH, Kim CJ - Emerging Infect. Dis. (2008)

Location of highly pathogenic avian influenza (HPAI) virus (H5N1) outbreaks, South Korea, 2006–2007. Black box on inset shows area of enlargement. Red circle represents outbreaks in Jeollabuk-Do (first, second, and third outbreaks). Blue circle represents those in Chungcheongnam-Do (fourth and fifth outbreaks). Black oval represents regions in which HPAI virus (H5N1) isolates were isolated from migratory bird habitats during this study.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2570817&req=5

Figure 1: Location of highly pathogenic avian influenza (HPAI) virus (H5N1) outbreaks, South Korea, 2006–2007. Black box on inset shows area of enlargement. Red circle represents outbreaks in Jeollabuk-Do (first, second, and third outbreaks). Blue circle represents those in Chungcheongnam-Do (fourth and fifth outbreaks). Black oval represents regions in which HPAI virus (H5N1) isolates were isolated from migratory bird habitats during this study.
Mentions: On December 21, 2006, the fourth outbreak of HPAI (H5N1) was confirmed in Asan, Chungcheongnam-Do, in breeder ducks that had shown a severe drop in egg production but no deaths. During intensive observation within the surveillance zone from the fourth outbreak farm, another HPAI (H5N1) outbreak was confirmed in Cheonan, Chungcheongnam-Do, on January 20, 2007, in a layer chicken farm with a 1% mortality rate (Figure 1). Compared with the rates in the first outbreak, the mortality rates in the more recent outbreaks were low (1%–4%) at notification time. This low proportion of deaths could be attributed to the early reporting system between the farmers and NVRQS, when the mortality rate reached ≈1% of the flock on poultry farms, and to the culling of flocks on reverse transcription–PCR confirmation (usually within 1 day) to prevent the spread of the disease. This could have limited the recorded observations when the infecting influenza virus was eliminated before the full extent of its pathogenicity could be manifested, usually after several days of infection.

Bottom Line: During the 2006-2007 winter season in South Korea, several outbreaks of highly pathogenic avian influenza virus (H5N1) were confirmed among domestic poultry and in migratory bird habitats.Phylogenetic analysis showed that all isolates were closely related and that all belong to the A/bar-headed goose/Qinghai/5/2005-like lineage rather than the A/chicken/Korea/ES/2003-like lineage.

View Article: PubMed Central - PubMed

Affiliation: Ministry of Agriculture and Forestry, Anyang, South Korea.

ABSTRACT
During the 2006-2007 winter season in South Korea, several outbreaks of highly pathogenic avian influenza virus (H5N1) were confirmed among domestic poultry and in migratory bird habitats. Phylogenetic analysis showed that all isolates were closely related and that all belong to the A/bar-headed goose/Qinghai/5/2005-like lineage rather than the A/chicken/Korea/ES/2003-like lineage.

Show MeSH
Related in: MedlinePlus