Abstract

Antimicrobial-resistant bacteria have been an increasing problem in human medicine and animal husbandry since the introduction of antimicrobials on the market in the 1940s. Over the last decades, efforts to reduce antimicrobial usage in animal husbandry have been shown to limit the development of resistant bacteria. Despite this, antimicrobial-resistant bacteria are still commonly detected and isolated worldwide. In this study, we investigated the presence of antimicrobial-resistant bacteria in bovine milk samples using a multiple approach based on culturing and amplicon sequencing. We first enriched milk samples obtained aseptically from bovine udders in the presence of two antimicrobials commonly used to treat mastitis and then described the resistant microbiota by amplicon sequencing and isolate characterization. Our results show that several commensal species and mastitis pathogens harbor antimicrobial resistance and dominate the enriched microbiota in milk in presence of antimicrobial agents. The use of the two different antimicrobials selected for different bacterial taxa and affected the overall microbial composition. These results provide new information on how different antimicrobials can shape the microbiota which is able to survive and reestablish in the udder and point to the fact that antimicrobial resistance is widely spread also in commensal species.

Details

Title
An in vitro evaluation of the effect of antimicrobial treatment on bovine mammary microbiota
Author
Winther, Anja R. 1 ; Perrin, Aurelie 2 ; Nordraak, Anne O. O. 3 ; Kjos, Morten 1 ; Porcellato, Davide 1 

 The Norwegian University of Life Sciences, Faculty of Chemistry, Biotechnology and Food Science, Ås, Norway (GRID:grid.19477.3c) (ISNI:0000 0004 0607 975X) 
 The Norwegian University of Life Sciences, Faculty of Chemistry, Biotechnology and Food Science, Ås, Norway (GRID:grid.19477.3c) (ISNI:0000 0004 0607 975X); Institute Agro Dijon, Dijon, France (GRID:grid.420114.2) (ISNI:0000 0001 2299 7292) 
 The Norwegian University of Life Sciences, Faculty of Chemistry, Biotechnology and Food Science, Ås, Norway (GRID:grid.19477.3c) (ISNI:0000 0004 0607 975X); Norwegian Defence Research Establishment, Kjeller, Norway (GRID:grid.450834.e) (ISNI:0000 0004 0608 1788) 
Pages
18333
Publication year
2024
Publication date
2024
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3090091969
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.