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Kaplan-Meier rate of infection after repeated i.r. challenges with SIVmac239. Macaques in groups 1 to 3 were inoculated intrarectally with 200 TCID50 of SIVmac239 every other week. The rate of SIV infection in groups 1 and 2 was not significantly different than that of group 3. The P value for the comparison of group 1 versus group 3 was 0.96. The P value for the comparison of group 2 versus group 3 was 0.28.
