Expert review of global real-world data on COVID-19 vaccine booster effectiveness and safety during the omicron-dominant phase of the pandemic

Rontgene Solante, Carlos Alvarez-Moreno, Erlina Burhan, Suwat Chariyalertsak, Nan Chang Chiu, Sunate Chuenkitmongkol, D. V. Dung, Kao Pin Hwang, Javier Ortiz Ibarra, Sasisopin Kiertiburanakul, Prasad S. Kulkarni, Christopher Lee, Ping Ing Lee, Rommel Crisenio Lobo, Alejandro Macias, Cao Huu Nghia, Anna Lisa Ong-Lim, Alfonso J. Rodriguez-Morales, Rosana Richtmann, Marco Aurélio Palazzi SafadiHindra Irawan Satari, Guy Thwaites

Research output: Contribution to journalReview articlepeer-review

22 Citations (Scopus)


Introduction: COVID-19 vaccines have been highly effective in reducing morbidity and mortality during the pandemic. However, the emergence of the Omicron variant and subvariants as the globally dominant strains have raised doubts about the effectiveness of currently available vaccines and prompted debate about potential future vaccination strategies. Areas covered: Using the publicly available IVAC VIEW-hub platform, we reviewed 52 studies on vaccine effectiveness (VE) after booster vaccinations. VE were reported for SARS-CoV-2 symptomatic infection, severe disease and death and stratified by vaccine schedule and age. In addition, a non-systematic literature review of safety was performed to identify single or multi-country studies investigating adverse event rates for at least two of the currently available COVID-19 vaccines. Expert opinion: Booster shots of the current COVID-19 vaccines provide consistently high protection against Omicron-related severe disease and death. Additionally, this protection appears to be conserved for at least 3 months, with a small but significant waning after that. The positive risk-benefit ratio of these vaccines is well established, giving us confidence to administer additional doses as required. Future vaccination strategies will likely include a combination of schedules based on risk profile, as overly frequent boosting may be neither beneficial nor sustainable for the general population.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalExpert Review of Vaccines
Issue number1
Publication statusAccepted/In press - 2022


  • AZD1222
  • booster
  • CoronaVac
  • COVID-19
  • mRNA
  • omicron
  • severe
  • vaccine effectiveness
  • waning immunity


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