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Survival times for mice after intraperitoneal challenge. Groups of 12 BALB/c mice were immunized with the indicated antisera containing specific polyclonal antibodies against the indicated antigens and challenged with 1 ×107 CFU of D39 intraperitoneally. Each dot represents one mouse. The horizontal lines denote the median survival time for each group. *, P < 0.05 compared between groups denoted by horizontal lines.
