tailieunhanh - Báo cáo khoa học: " Seroprevalence of low pathogenic avian influenza (H9N2) and associated risk factors in the Gyeonggi-do of Korea during 2005-2006"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Seroprevalence of low pathogenic avian influenza (H9N2) and associated risk factors in the Gyeonggi-do of Korea during 2005-2006 | J. Vet. Sci. 2008 9 2 161-168 JOURNAL OF Veterinary Science Seroprevalence of low pathogenic avian influenza H9N2 and associated risk factors in the Gyeonggi-do of Korea during 2005-2006 Jong-Tae Woo1 Bong Kyun Park2 1Gyeonggi-do Veterinary Service Suwon 441-460 Korea 2College of Veterinary Medicine and BK21 Program for Veterinary Science Seoul National University Seoul 151-742 Korea Between November 2005 and March 2006 a total of 253 poultry flocks in the Gyeonggi-do of Korea were examined for seroprevalence against avian influenza AI using a hemagglutination inhibition HI test and an agar gel precipitation test. No low pathogenic avian influenza LPAI virus was isolated from 47 seropositive flocks that lacked clinical signs during sampling. The unadjusted percentage of seroprevalence rates of layer and broiler flocks were not significantly different . 26 25 96 and 23 22 97 respectively. The HI titer of the layers mean 89 was higher than the broilers mean 36 p . A cross-sectional study was conducted for the seroprevalence of LPAI in the layers. Of 7 risk factors farms employing one or more workers had a higher seropositive prevalence as compared to farms without hired employees adjusted prevalence OR p . Layer flocks older than 400 d had higher seropositivity than flocks younger than 300 d OR p . The farmers recognized at least one of the clinical signs in seropositive flocks such as decreased egg production respiratory syndromes and increased mortality OR p . In a matched case-control study 20 pairs of case and control flocks matched for type of flock hired employees age and flock size were compared. Frequent cleansing with disinfectants was associated with a decreased risk of seropositivity OR p . Although there was a low statistical association using a foot disinfectant when entering the building led to a decreased rate of seropositivity OR p . Keywords avian influenza HPAI virus LPAI virus risk factors