Received: 15-03-2023 / Accepted: 05-01-2024
The purpose of this study was to identify Salmonella typhimurium (S.typhimurium), causing salmonellosis in layer ducks farmed in Phung Thuong commune, Phuc Tho, Ha Noi. A total of 32 farm households were selected based on farm-scale and breeding method. Forty-four salmonelosis-suspected ducks were necropsied to monitor gross lessions; of which, 33 ducks had gross lessions of the disease. We collected livers (15 samples), spleens(11 samples), and ovary (7 samples) from 33 ducks with gross lession of the disease, besides, irregular egg yolks (15) were collected for bacteria isolation and then typing by PCRmethod. Results indicated that liver samples had the highest percentage of positive samples (60.0%), followed by spleen (54.5%), ovary (42.9%) and the lowest was the irregular egg yolk sample (40.0%). Twenty-four S.typhimurium strains were isolated and detected by PCR method. Testing the antibiotic sensitivity of the S.typhimurium isolates showed that thesestrains were most susceptible to colistin(100%), followed by doxycycline (79.2%) and gentamicin (70.8%) but moderately sensitvie or resistant to amoxicillin, ampicillinand neomycin.