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Potency of transmission-blocking (TB) activity, as a mean percentage in oocyst reduction, of 37 sera with a high level of transmission (90–100%) after 2-fold dilutions. Each dilution point corresponds to the mean value of sera stratified as a high level of transmission (90–100%), intermediate level of transmission (50–89%), low level of transmission (0–49%), and no transmission or enhancing effect (< 0%).
