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Kaplan-Meier survival plots of African buffalo in the Kruger Park study according to their serostatus for antibody against Rift Valley fever virus (RVFV). Lines indicate the cumulative age- and sex-adjusted percent survival (in years) of 51 animals seropositive for antibodies against RVFV (gray line) or 116 animals seronegative for antibodies against RVFV (dark line) that were serially monitored for survival during the period of the study.
