From: Measures of clinical malaria in field trials of interventions against Plasmodium falciparum
 |  |  | Vaccine effect | ||
---|---|---|---|---|---|
 |  | Placebo | A: Reduction in force of infection by 50% | B: Reduction in parasite densities by 50% | C: Multi-plication of pyrogenic threshold by 2 |
Prevalence of patent infection | 80% | 40% | 77% | 80% | |
Relative incidence of disease | All episodes | 100.0 | 77.2 | 74.0 | 74.0 |
 | Malaria | 45.5 | 22.8 | 19.6 | 19.6 |
 | Non malaria | 54.5 | 54.5 | 54.5 | 54.5 |
True efficacy in preventing clinical malaria episodes | - | 50% | 57% | 57% | |
True efficacy in preventing any disease episode | - | 22.8% | 26.0% | 26.0% |