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Somatic cell count (a) and concentrations of IL-1β (b), TNF-α (c) and IL-8 (d) in the milk in bovine experimental S. epidermidis (-○-) and S. simulans (-●-) intramammary infection during the two-week study period (mean ± SEM, n = 8 + 8; TNF-α n = 8 + 7). Milk IL-8 (p = 0.04) and IL-1β (p = 0.03) concentrations were higher in response to infection with S. simulans than with S. epidermidis. The SCC is expressed as a natural logarithm of cells/mL.
