Concentrations of ELR+CXC neutrophil-oriented chemokines CXCL1 (A), CXCL2 (B), CXCL3 (C), and CXCL8 (D) in milk of quarters infused with either MDP, S. aureus LTA, or LTA plus MDP from the time of infusion (time zero) to 96 hpi. Data are from six cows (median values and interquartile ranges). *, significantly increased or decreased (CXCL3) concentrations relative to that at time zero (P < 0.05); $, significant difference between LTA plus MDP and LTA or MDP alone (P < 0.05).