vaccine efficacy

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VE = (DU - DV)/DU x 100% = (1-RR) x 100%

VE: vaccine efficacy

DV: disease in vaccinated

DU: disease in unvaccinated

RR: relative risk

Additional terms


  1. Wikipedia: Vaccine efficacy
  2. Orenstein WA, Bernier RH, Dondero TJ et al Field evaluation of vaccine efficacy. Bull World Health Organ. 1985;63(6):1055-68. PMID:; PMCID: PMC2536484.