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Article Abstract
Objectives: The objective of the present study was to examine the diversity of Staphylococcus aureus from mastitis milk samples of cows in Rwanda.
Methods: A total of 1080 quarter milk samples from 279 dairy cows were collected in 80 different farms from all five provinces of Rwanda. In total, 135 S. aureus isolates were obtained and subjected to genotyping (spa typing, DNA microarray, whole-genome sequencing (WGS)), antimicrobial susceptibility testing (AST) and phenotypic profiling by Fourier Transform Infrared (FTIR) spectroscopy (including capsular serotyping).
Results: Resistance to penicillin and/or tetracycline was most frequently observed. Ten sequence types (STs) (ST1, ST151, ST152, ST5477, ST700, ST7110, ST7983, ST7984, ST8320, ST97) belonging to seven clonal complexes (CCs) (CC1, CC130, CC152, CC3591, CC3666, CC705, CC97) were detected. The Panton-Valentine leukocidin (PVL) genes (lukF-PV/lukS-PV), the bovine leukocidin genes (lukM/lukF-P83) and the human and bovine toxic shock syndrome toxin gene tst-1 variants were detected. FTIR-based capsular serotyping showed CC-specific differences. Most CC97 (cap5 allele) isolates were primarily nonencapsulated (82%), whereas isolates of CC3591 and CC3666 (cap8 allele) were mostly encapsulated (86.4% and 57.8%, respectively). Our results underline the widespread global distribution of cattle-adapted CC97.
Conclusion: The presence of CC3591 and CC3666 in bovine mastitis suggests an important role in cattle health and dairy production in Rwanda. The results of the present study support the need for a rigorous One-Health Surveillance program of the bovine-human interface.
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| http://dx.doi.org/10.1016/j.jgar.2024.01.017 | DOI Listing |
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Diversity of Staphylococcus aureus associated with mastitis from dairy cows in Rwanda.
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March 2024
Institute of Microbiology, University of Veterinary Medicine Vienna, Vienna, Austria. Electronic address:
Article Synopsis
- - The study aimed to analyze the diversity of Staphylococcus aureus in cow mastitis milk samples across Rwanda, collecting 1080 samples from 279 dairy cows on 80 farms.
- - Researchers identified 135 S. aureus isolates using advanced techniques like genotyping and antimicrobial susceptibility testing, revealing significant resistance to penicillin and tetracycline, along with diverse genetic profiles among the bacteria.
- - Findings indicated the presence of specific clonal complexes (CCs) associated with mastitis, highlighting their potential impact on cattle health and the need for enhanced surveillance to monitor the connection between animal and human health.
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