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Type of publication: Journal Article
Type of document: Full Paper

Year: 2020

Authors: Hess, C; Grafl, B; Bagheri, S; Kaesbohrer, A; Zloch, A; Hess, M

Title: Antimicrobial Resistance Profiling of Gallibacterium anatis from Layers Reveals High Number of Multiresistant Strains and Substantial Variability Even Between Isolates from the Same Organ.

Source: Microb Drug Resist. 2020 26 (2) 169-177.

Authors Vetmeduni Vienna:

Bagheri Sina
Grafl Beatrice
Hess Claudia
Hess Michael
Käsbohrer Annemarie
Zloch Angelika

Vetmed Research Units
University Clinic for Poultry and Fish Medicine, Clinical Unit of Poultry Medicine
Institute of Food Safety, Food Technology and Veterinary Public Health, Unit of Veterinary Public Health and Epidemiology

In this investigation, data on antimicrobial resistance (AMR) profiles of 213 Gallibacterium anatis isolates were determined from 93 laying hens originating from 39 flocks. Each flock was sampled three times during its life time for the presence of G. anatis . The broth microdilution method was applied comprising 21 antimicrobial substances. Multidrug resistance was found in 96.2% of the G. anatis isolates. Most of the isolates were resistant to tetracycline (89.2%), tylosin (94.8%), enrofloxacin (58.2%), nalidixic acid (77.4%), and sulfamethoxazole (77.0%). Resistance against antimicrobial substances increased significantly with the age of birds. A total of 99 different AMR profiles were detected. On flock level, different AMR profiles were found in 71.8% of the flocks independent of the sampling time point. On bird level, identical AMR profiles were mostly found in isolates originating from the same organ of a single bird, but 22 such paired isolates differed in their AMR profile. Variations of AMR profiles were found within isolates from a single bird, but from different organs. Isolates from systemic organs were significantly more resistant to different antimicrobial substances compared to isolates from the reproductive tract. No influence could be found in regard to an increase of resistance and applied antibiotic treatment.

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