Sommer, Martin (2025). Keimspektrum und Antibiotikaresistenzen bei boviner Mastitis im Rahmen des Projektes «ReLait». (Thesis). Universität Bern, Bern
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Abstract
This sub-study describes the results of mastitis milk samples collected in the canton of Fribourg. In the «Re-Lait» project, a total of 2,441 milk samples were submitted from which 3,028 pathogens were isolated. Most milk samples were collected and analyzed for subclinical mastitis (n=1,524) or before the dry period (n=463). Only a few milk samples came from cows with clinical mastitis (n=123). The most frequently diagnosed pathogens were non-aureus staphylococci (NAS) at 37,4 %. In addition, frequently diagnosed bacteria were aesculin-positive streptococci, coliform and coryneform bacteria, and mixed flora. The resistance situation among NAS was particularly striking with 73,6 % NAS showing a penicillin resistance. This rate has increased compared to previous Swiss studies where penicillin-resistant isolates of 31 % and 54,2 % in 2013 and 2014 respectively were found. Increased antimicrobial resistance to aminopenicillins (90,3 %) and amoxicillin/clavulanic acid (20,8 %) was found among coliform bacteria. However, due to the geographically limited sampling area, this increased resistance development cannot be extrapolated to the whole of Switzerland. The results, however, show that the resistance situation of some bacteria is alarming regionally. To counteract this, the use of antibiotics for the treatment of subclinical or clinical mastitis should be reconsidered. Bacterial milk culture is always indicated to ensure specific bacterial treatment with or without antibiotics.
| Item Type: | Thesis |
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| Dissertation Type: | Single |
| Date of Defense: | 29 July 2025 |
| Subjects: | 600 Technology > 610 Medicine & health 600 Technology > 630 Agriculture |
| Institute / Center: | 05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) |
| Depositing User: | Hammer Igor |
| Date Deposited: | 30 Dec 2025 14:24 |
| Last Modified: | 30 Dec 2025 14:24 |
| URI: | https://boristheses.unibe.ch/id/eprint/7011 |
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