Common Mastitis Pathogens in Dairy Cows: S. aureus, E. coli & More
| Pathogen type | Representative species | Representative species |
| Gram-positive | Staphylococcus aureus | Biofilm formation, multidrug-resistant (e.g., MRSA) |
| Streptococcus agalactiae | Obligate mammary parasite, spread during milking | |
| Gram-negative | Escherichia coli | Endotoxin triggers systemic inflammation (e.g., endotoxic shock) |
| Klebsiella spp. | Environmental pathogen, prevalent in wet bedding | |
| Others | Mycoplasma (e.g., M. bovis) | Cell-wall–free; β-lactam antibiotics ineffective |
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