A WHO expert committee is evaluating the impact of a new malaria vaccine. They calculate that the vaccine reduces malaria incidence from 40 per 1000 p...

Question

A WHO expert committee is evaluating the impact of a new malaria vaccine. They calculate that the vaccine reduces malaria incidence from 40 per 1000 person-years in the control group to 15 per 1000 person-years in the vaccine group. What is the vaccine efficacy?

Accepted Answer

62.5%

Answer

37.5%

Answer

50%

Answer

75%

Answer

85%

uk-dtmh MCQ (SBA): Vaccine Efficacy Calculation

A WHO expert committee is evaluating the impact of a new malaria vaccine. They calculate that the vaccine reduces malaria incidence from 40 per 1000 person-years in the control group to 15 per 1000 person-years in the vaccine group. What is the vaccine efficacy?