is about participates in has member vaccination efficacy measured vaccination efficacy A measurement datum that is about a vaccination efficacy and is the specified output of a vaccination efficacy study. A vaccination efficacy that results from a vaccination efficacy study. VaccinationEfficacyMeasured 1. Apollo-SV does not distinguish between ‘vaccine efficacy’ and ‘vaccine effectiveness.’ 2. Apollo-SV also considers the use of ‘vaccine’ in both terms a misnomer. vaccination measurement datum organism PCO:collection of organisms