Featured Resource: WHO COVID-19 Vaccine Effectiveness Guidance
The following information and message is from Danny Feikin and Minal Patel, Department of Immunization, Vaccines and Biologicals (IVB), World Health Organization.
WHO’s interim guidance “Evaluation of COVID-19 vaccine effectiveness” is now available: https://www.who.int/tools/covid-19-vaccine-introduction-toolkit#Evaluation%20of%20COVID-19%20vaccine%20introduction
The vaccine effectiveness and impact interim guidance outlines how to assess COVID-19 vaccine effectiveness (VE) using observational study designs. It discusses critical considerations in the design, analysis and interpretation of COVID-19 VE evaluations, as biased results may be produced even in settings where data completeness and quality are high. This guidance is targeted mostly for evaluations undertaken in low- and middle-income countries but most of the concepts also apply to VE evaluations in high-income settings.