What is the difference between efficacy and effectiveness? | Gavi, the Vaccine Alliance https://www.gavi.org/vaccineswork/what-difference-between-efficacy-and-effectiveness?fbclid=IwAR1LWn5OxviYPhyh_Jok3GT2FF84u7PvzQcPEOuOGuxix7otUaEe2oIVCpA
What is the difference between efficacy and effectiveness? | Gavi, the Vaccine Alliance https://www.gavi.org/vaccineswork/what-difference-between-efficacy-and-effectiveness?fbclid=IwAR1LWn5OxviYPhyh_Jok3GT2FF84u7PvzQcPEOuOGuxix7otUaEe2oIVCpA