Journal Article

Evaluation of post-introduction COVID-19 vaccine effectiveness: Summary of interim guidance of the World Health Organization

Wilder-Smith, Annelies, Kang, Gagandeep, L'Azou Jackson, Maïna, Verani, Jennifer R., Katz, Mark A., Pebody, Richard, Nogareda, Francisco, Lipsitch, Marc, Cowling, Benjamin J., Mwenda, Jason M., Valenciano, Marta, Ortiz, Justin R., Joshi, Sudhir, Feikin, Daniel R., Patel, Minal K., Bresee, Joseph S., Crowcroft, Natasha S., Smith, Peter G., Schrag, Stephanie J., Hirve, Siddhivinayak, Lanata, Claudio F., Vaughn, David W., Fahmy, Kamal, Orenstein, Walter A., Bergeri, Isabel, Srikantiah, Padmini, Subissi, Lorenzo

2021

Overview

Phase 3 randomized-controlled trials have provided promising results of COVID-19 vaccine efficacy, ranging from 50 to 95% against symptomatic disease as the primary endpoints, resulting in emergency use authorization/listing for several vaccines. However, given the short duration of follow-up during the clinical trials, strict eligibility criteria, emerging variants of concern, and the changing epidemiology of the pandemic, many questions still remain unanswered regarding vaccine performance. Post-introduction vaccine effectiveness evaluations can help us to understand the vaccine's effect on reducing infection and disease when used in real-world conditions. They can also address important questions that were either not studied or were incompletely studied in the trials and that will inform evolving vaccine policy, including assessment of the duration of effectiveness; effectiveness in key subpopulations, such as the very old or immunocompromised; against severe disease and death due to COVID-19; against emerging SARS-CoV-2 variants of concern; and with different vaccination schedules, such as number of doses and varying dosing intervals. WHO convened an expert panel to develop interim best practice guidance for COVID-19 vaccine effectiveness evaluations. We present a summary of the interim guidance, including discussion of different study designs, priority outcomes to evaluate, potential biases, existing surveillance platforms that can be used, and recommendations for reporting results.

• Publisher: Elsevier Ltd,Elsevier Limited,Elsevier Science
• Subject: Allergy and Immunology / Asymptomatic / Best practice / Clinical trials / Conference Report / Coronaviruses / COVID-19 / COVID-19 diagnostic tests / COVID-19 infection / COVID-19 Vaccines / death / disease severity / Disease transmission / Dosage / Dyspnea / Enrollments / Epidemiology / Fever / Health surveillance / Humans / Infections / issues and policy / monitoring / pandemic / Pandemics / Performance evaluation / Public health / Questions / SARS-CoV-2 / Schedules / Severe acute respiratory syndrome coronavirus 2 / Subpopulations / Vaccination / Vaccine effectiveness / Vaccine efficacy / Vaccines / Viral diseases / World Health Organization