Từ Thanh Dung * , Freddy Haesebrouck , Partrick Sorgeloos , Margo Baele , Annemie Decostere Nguyễn Anh Tuấn

* Tác giả liên hệ (ttdung@ctu.edu.vn)

Abstract

The purpose of this study was to assess the in vitro susceptibility of 64 Vietnamese isolates of Edwardsiella ictaluri, the causal agent of the infectious disease Bacillus Necrosis Pangasius (BNP) in Pangasianodon hypophthalmus, using the agar dilution technique. None of the isolates displayed acquired resistance to amoxicillin, amoxicillin-clavulanic acid, chloramphenicol, florfenicol, gentamicin, kanamycin, neomycin and nitrofurantoin. Acquired resistance to streptomycin was detected in 83%, to oxytetracycline in 81% and to trimethoprim in 71% of the isolates. The MICs of enrofloxacin displayed indicating reduced susceptibility of a minority of isolates (3 out of the 64). For the quinolone antimicrobial agents flumequin and oxolinic acid, acquired resistance was encountered in 8 and 6% of the strains, respectively. All strains were intrinsically resistant to the polypeptide antimicrobial agent colistin. Resistance phenotypes of the E. ictaluri isolates were shown highly (73%) acquired resistance to at least three antimicrobial agents. The results of this study emphasize the strict need to control both the prophylactic and curative use of antimicrobial agents in Vietnamese aquaculture.
Keywords: Edwardsiella ictaluri, Pangasianodon hypophthalmus, theMekongDelta

Tóm tắt

Mục tiêu của nghiên cứu là đánh giá sự kháng thuốc kháng sinh trên 64 chủng vi khuẩn E. ictaluri, là tác nhân gây bệnh gan, thận mủ (BNP) trên cá tra Pangasianodon hypophthalmus. Nghiên cứu này đã sử dụng phương pháp pha loãng thuốc trên môi trường thạch. Kết quả không tìm thấy sự kháng thuốc của vi khuẩn với thuốc kháng sinh amoxicillin, amoxicillin-clavulanic acid, chloramphenicol, florfenicol, gentamicin, kanamycin, neomycin và nitrofurantoin. Tuy nhiên, đa số vi khuẩn E. ictaluri đã kháng với streptomycin (83% chủng vi khuẩn), oxytetracycline (81%), trimethoprim (71%) và kháng với nhóm quinolone như: flumequin (8%), oxolinic acid (6%) và enrofloxacin (5%). Trong khi đó, hầu hết vi khuẩn đã kháng thuốc tự nhiên đối với khánh sinh colistin (polypeptide). Đặc biệt, kết quả đã xác định trên 73 % chủng vi khuẩn E. ictaluri biểu hiện sự đa kháng thuốc (kháng ít nhất 3 loại thuốc). Kết quả nghiên cứu đã cảnh báo sự cần thiết kiểm soát nghiêm ngặt việc dùng thuốc kháng sinh để phòng trị bệnh trong nuôi trồng thủy sản ở Việt Nam.
Từ khóa: Kháng thuốc kháng sinh, Edwardsiella ictaluri, Pangasianodon hypophthalmus, Đồng bằng sông Cửu Long

Article Details

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