J Wildl Dis.: Comparison of outbreaks of H5N1 highly pathogenic avian influenza in wild birds and poultry in Thailand.
Avian influenza (Diagnosis)
Avian influenza (Research)
Birds (Health aspects)
Disease transmission (Research)
|Publication:||Name: Journal of Avian Medicine and Surgery Publisher: Association of Avian Veterinarians Audience: Academic Format: Magazine/Journal Subject: Health Copyright: COPYRIGHT 2009 Association of Avian Veterinarians ISSN: 1082-6742|
|Issue:||Date: Dec, 2009 Source Volume: 23 Source Issue: 4|
|Topic:||Event Code: 310 Science & research|
|Geographic:||Geographic Scope: Thailand Geographic Code: 9THAI Thailand|
Wild bird surveillance for highly pathogenic avian influenza (HPAI)
H5N1 virus from 2004 to 2007 in Thailand indicated that the prevalence
of infection with avian influenza H5N1 virus in wild birds was low
(1.0%, 95% confidence interval [CI], 0.7-1.2; 60/6263 pooled samples).
However, the annual prevalence varied considerably over this period,
with a peak of 2.7% (95% CI, 1.44.1) in 2004. Prevalence dropped to 0.5%
(95% CI, 0.3-0.8]) and 0.6% (95% CI, 0.3-1.0) in 2005 and 2006,
respectively, and then increased to 1.8% (95% CI, 1.0-2.6) in 2007.
During this period, 16 species from 12 families of wild birds tested
positive for H5NI virus infection. All samples from juvenile birds were
negative for H5N1 virus, whereas 0.6% (95% CI, 0.4-0.9) of pooled
samples from adult birds were positive. Most positive samples originated
from peridomestic resident species. Infected wild-bird samples were only
found in provinces where poultry outbreaks had occurred. Detection of
H5N1 virus infection in wild birds was reported up to 3 years after
eradication of the poultry outbreaks in those provinces. As observed
with outbreaks in poultry, the frequencies of H5N1 outbreaks in wild
birds were significantly higher in winter. Further understanding of the
mechanisms of persistence and ongoing HPAI H5N1 transmission between
wild birds and domestic poultry is needed.
|Gale Copyright:||Copyright 2009 Gale, Cengage Learning. All rights reserved.|