AI Article Synopsis
- Understanding the epidemiological patterns of Staphylococcus aureus is crucial for controlling infections in dairy herds.
- This study utilized pulse field gel electrophoresis and virulence gene assessments, finding that Staph. aureus was present in teat skin, milk, and curd samples, confirming herd-specific strains.
- Results indicated teat skin serves as a significant reservoir for Staph. aureus, including in previously negative cows, suggesting some strains are particularly resilient and pose a contamination risk to milk products.
Article Abstract
Knowledge of the epidemiological pattern and the potential sources of infections is important to control Staphylococcus aureus in dairy herds. This paper reports the results of a study applying both pulse field gel electrophoresis (PGFE) and the assessment of a selected number of virulence genes to investigate the role of teat skin on Staph. aureus transmission among cows and on the contamination of milk. Overall 61 isolates were considered, 23 from teat skin, 33 from milk samples and 5 from curd samples. Teat swabs were taken in five herds, but in only three of them could Staph. aureus be isolated. Curd was sampled in three herds, but Staph. aureus could be isolated in only two herds. The distribution of isolates among herds confirmed the presence of herd-specific Staph. aureus strain in most of the herds. The same pattern was observed in teat skin samples, in quarter milk samples, and in the curd samples. Our findings are consistent with other studies showing the role of teat skin as a potential reservoir. Moreover, Staph. aureus was isolated from teat skin of confirmed Staph. aureus-negative cows that were segregated from infected ones. Our findings also suggest that some strains have higher chances to survive on teat skin and therefore to increase the risk for contamination of milk and milk products due to the persistence of intramammary infections.
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| http://dx.doi.org/10.1017/S0022029908003671 | DOI Listing |
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