Đặc điểm lây nhiễm của virus dịch tả heo châu Phi Genotype II ở các ổ dịch

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Tác giả: Tiến Duy Đỗ, Công Danh Lại, Thị Hồng Nhớ Lê, Chế Thanh Nguyễn, Minh Nam Nguyễn, Tất Toàn Nguyễn, Thị Mỹ Duyên Nguyễn, Hoàng Vũ Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học kỹ thuật Thú y, 2023

Mô tả vật lý: tr.5

Bộ sưu tập: Metadata

ID: 340990

Thêm vào giỏ Liên kết toàn văn

Mục tiêu của nghiên cứu này là bước đầu khảo sát đặc điểm nhiễm virus dịch tả lợn châu Phi (ASFV) trên heo nái theo một số yếu tố tiếp xúc, loại hình chăn nuôi và thời gian phát bệnh tại trại. Kết quả nghiên cứu cho thấy tỷ lệ nhiễm bệnh của heo ở trại hở cao hơn ở trại kín (p<
0,05) và ở trại tái nhiễm cao hơn ở trại nhiễm lần đầu (p<
0,05). Tỷ lệ này cũng ghi nhận ở trại có thời gian phát bệnh >
1 tuần cao hơn so vớiở trại có thời gian phát bệnh <
1 tuần (p<
0,001) và ở heo tiếp xúc trực tiếp với heo F0 cao hơn so với ở heo tiếp xúc gián tiếp gần và tiếp xúc gián tiếp xa với heo F0 (p<
0,001). Tỷ lệ dương tính với ASFV của mẫu máu là 35,56% (16/45)
trong khi đó tỷ lệ dương tính của mẫu dịch ngoáy miệng là 22,22% (10/45). Hàm lượng ASFV trong mẫu máu cũng ghi nhận cao hơn so với mẫu dịch ngoáy miệng (p<
0,01). Kết quả phântích trình tự gen cho thấy 6 chủng ASFV thu thập đều thuộc genotype II và tương đồng với các chủng đã được xác định tại Việt Nam và các nước lân cận.The objective of this study was to initially investigate the prevalence of African swine fever virus (ASFV) in the sows in some infected farms considering a number of epidemiological factors, such as: contact characteristics, farm model and disease outbreak time at the farm. The studied result showed that the infection rate of pigs in the opened farm system was higher than in the closed farm system (p<
0.05) and in the re-infection farm was higher than in the first infection farm (p<
0.05). This rate in the farm with outbreak time >
1 week was higher than in the farm with outbreak time <
1 week (p<
0.001) and in the pigs directly contacted with F0 pigs was higher than in the pigs indirectly contacted with F0 pigs (p<
0.001). The positive rate of blood samples was 35.56% (16/45), while the positive rate of the oral swab samples was 22.22% (10/45). The concentration of ASFV in the blood sample was also higher than that of the swab sample (p<
0.01). The results of gene sequence analysis showed that all the six ASFV collected strains belonged to genotype II and was similar compared to the strains already identified in Viet Nam and in the neighboring countries.

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