Received: 07-02-2017 / Accepted: 03-04-2017
1500 swab pools were collected from poultry and birds in 15 live-bird markets in 5 provinces in the north of Vietnam from July 2015 to July 2016 to determine the prevalence of avian influenza A virus (H5N6, H5N1 and H7N9) in these provinces. We identified 343 positive samples in 1500 samples with the prevalence of 22.86 percent for influenza type A viruses. 69/1500 samples (4.60%) from 4 provinces (Lang Son, Quang Ninh, Cao Bang and Lao Cai) were positive with H5 subtype virus. For avian influenza A/N6 subtype virus, we detected 49/1500 (3.27%) positive samples with prevalence in Lang Son, Quang Ninh, Cao Bang and Lao cai (6.0%; 5.0%; 2.33% and 3.0%, respectively). The results showed 7/1500 (0.47%) positive samples with avian influenza A/H5N1 virus in Cao Bang, Lang Son and Quang Ninh.