No significant differences in efficacy between the vaccine and placebo groups were observed at any point during the study. An additional adjudicated case of S aureus infection in a V710 vaccine recipient had been excluded from the primary analysis because it had been determined during a quality-assurance audit that the site might have used questionable clinical practices. Inclusion of this additional adjudicated case yielded a nonsignificant vaccine efficacy of 14.8% Two cases from each group were reported after termination of the trial and consequently not adjudicated. Counting all cases, overall vaccine efficacy with respect to the primary end point was also nonsignificant