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Intramammary infection with E. coli or S. aureus increases concentrations of BSA in milk. As a marker of mammary vascular permeability, BSA levels were assayed by ELISA in milk samples obtained from quarters immediately prior to and at various times following intramammary infusion with saline, E. coli, or S. aureus. Mean (± standard error) BSA levels are shown. * and #, significantly increased in E. coli- or S. aureus-infected quarters, respectively, relative to time zero (P < 0.05).
