Sự vấy nhiễm và nhạy cảm đối với kháng sinh của vi khuẩn Staphylococcus aureus phân lập tại cơ sở giết mổ heo tỉnh An Giang
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Abstract
A total of 252 pork and environmental samples were collected at slaughterhouses, the contamination of Staphylococcus aureus was recorded at 16.67% on pork samples and 39.06% on environmental samples. The prevalence of S. aureus on pork and the environment samples between small-scale and centralized slaughterhouses were not statistically different. The average contamination density of S. aureus on pork was 7x101CFU/g at small-scale slaughterhouses and 3x101CFU/g at centralized slaughterhouses. The isolated S. aureus were examined for antimicrobial susceptibility. The results showed that they were sensitive to several examined antibiotics but were highly resistant to colistin (73.68%), ceftazidime (57.89%), and tetracycline (52.63%). There was the presence of a number of antibiotic resistance genes in the collected S. aureus strains, of which the tetA gene accounted for the highest proportion (26.58%). The study results showed a high prevalence of S. aureus resistant to antibiotics in slaughterhouses, which has been a risk to consumer health.
Tóm tắt
Tổng số 252 mẫu thịt heo và môi trường được thu thập tại các lò mổ, ghi nhận tỷ lệ hiện diện của Staphylococcus aureus trên mẫu thịt là 16,67% và trên mẫu môi trường là 39,06%. Tỷ lệ vấy nhiễm S. aureus trên mẫu thịt và môi trường giữa các cơ sở nhỏ lẻ và tập trung không có sự khác biệt có ý nghĩa thống kê. Mật độ vấy nhiễm trung bình của S. aureus trên mẫu thịt là 7x101CFU/g tại cơ sở nhỏ lẻ và 3x101CFU/g tại cơ sở tập trung. Các chủng S. aureus phân lập được kiểm tra sự nhạy cảm với kháng sinh. Kết quả cho thấy, các chủng này còn nhạy cảm với nhiều loại kháng sinh nhưng đã đề kháng cao với colistin (73,68%), ceftazidime (57,89%) và tetracycline (52,63%). Có sự hiện diện của một số gene mã hóa đề kháng kháng sinh trên các chủng S. aureus thu thập, trong đó, gene tetA chiếm tỷ lệ cao nhất (26,58%). Kết quả nghiên cứu cho thấy sự hiện diện cao của các chủng S. aureus đề kháng kháng sinh tại các cơ sở giết mổ là mối nguy cơ đối với sức khoẻ người tiêu dùng.
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