24. A new vaccine against an infectious disease has recently been tested in an RCT to protect against severe disease and death. Of the 876 children randomly assigned to the new vaccine 175 died of the 1774 children assigned to the placebo 533 died. The most appropriate statistic to report using these data is: A. Vaccine effectiveness B. Vaccine efficacy C. Vaccine homotrophy D. Vaccine heterotrophy E. homosymmetry