Prevalence of highly pathogenic avian influenza (HPAI) virus in live poultry markets, in Quang Tri province, 2016

Abstract

The study was conducted on 180 pharynx swab samples and 60 environmental samples (30 fecal samples and 30 water samples) to detect the presence of Avian influenza type A/H5N1, H5N6, H7N9 viruses in some live poultry markets in Quang Tri province. The studied results showed that the positive sample rate with avian influenza type A virus was 18.33% (44/240 samples), of which 2.08% of samples (5/240 samples) were positive with subtype H5N6. All of the collected samples were negative with H5N1 and H7N9. The positive sample rate with influenza type A virus was highest (29.17%, 14/48 samples) in poultry samples collected from Dong Ha market and the lowest positive sample rate was at Dien Sanh market with 10.42% (5/48 samples). Meanwhile, the prevalence of A/H5N6 virus in Ho Xa and Dong Ha markets was highest (4.16%), followed by the Cau market (2.08%), and this subtype virus was not found in other markets. The prevalence of influenza A virus in the throat swab samples collecting in the live ducks, chickens and fresh feces were 17.77%, 27.77% and 10%, respectively. Among the monitoring samples, the prevalence of avian influenza A/H5N6 virus was only detected in the chicken throat swab samples (5.55%). In Quang Tri province, the prevalence of avian influenza A virus was highest in October (30%) and lowest in May (7.5%). However, the avian influenza A/H5N6 virus was only detected in September (5.0%) and July (2.5%), it was not found in the remaining studied months.