Intra-mammary (IM) bacterial infection in cattle can result in clinical outcomes that range from being acute and life-threatening to those that are chronic and sub-clinical. The typical bacteria involved in IM bacterial infections activate the mammary immune system in different ways which can influence the severity of the outcome. A clear understanding of the mechanisms that activate and regulate this response is central to the development of effective preventative and treatment regimes. This review focuses on the different immune responses of the bovine mammary gland to common mastitis-causing pathogens. There is special emphasis on comparing the responses to Escherichia coli and Staphylococcus aureus infections, as these are typically associated, respectively, with acute/severe and chronic/sub-clinical forms of the disease.
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