Xác định tỷ lệ nhiễm và chủng virus gây bệnh Gumboro trên gà ở Thái Nguyên

Abstract

On investigating Gumboro disease epidemiology in chickens raised in Thai Nguyen province, it shows that prevalence of infected chickens in Phu Binh is higher than that in Dong Hy (61.88% and 55.18%, respectively). The prevalence of those unvaccinated, once vaccinated, and twice vaccinated are 77.45%, 66.21%, and 36.52%, respectively. The highest prevalence 74.49% is found in the entire captivity breeding method. Luong Phuong breed (72.43%) is more infected than those of Tam Hoang (65.28%), Mia (50.41%), and Ri (63.36%). Examining chicken eggs, 90.4% samples are positively inflected with Gumboro virus. After 5 times of isolation, the Gumboro virus strain DH65 shows typical disease syndromes, with increasing embryonic deaths found remarkably during 48-72 hours.