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Effects of intramammary infection with E. coli or S. aureus on concentrations of IL-8 and C5a in milk. Levels of IL-8 (A) and C5a (B) in milk following intramammary bacterial or saline challenge were determined by ELISA. Mean (± standard error) IL-8 and C5a concentrations are shown. * and #, significantly increased in E. coli- or S. aureus-infected quarters, respectively, relative to time zero (P < 0.05).
