You are here Home Glossary of technical terms Glossary of technical terms effectiveness Listen Print Share Twitter Facebook Email A measure of how well a vaccine works in a defined population in ‘uncontrolled’ or routine circumstances — for example, in a vaccination program. Page history Last updated 11 June 2018 Last reviewed 11 June 2018 Is there anything wrong with this page? Help us improve the Australian Immunisation Handbook What you were doing? (required) What went wrong? (required) Leave this field blank