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Opsonic activity of rabbit sera to CP5-CRM or CP8-CRM against S. aureus Reynolds (CP5) and Reynolds (Δcap5H). The rabbit sera were serially diluted 3-fold, starting at a 1:40 initial dilution. The results are expressed as percent change in the number of CFU/ml after 2 h. The data shown are means (± standard errors) of three experiments. Differences were analyzed by the Student t test. *, P < 0.05; **P < 0.001.
