mRNA-based COVID-19 Vaccines Booster Dose: Benefits, Risks and Coverage

Area of Science:

• Immunology
• Public Health
• Vaccinology

Background:

• COVID-19 third-dose booster programs are expanding globally.
• There is a lack of robust evidence regarding the effectiveness, safety, and optimal timing of these boosters.
• Ethical considerations and disparities in vaccine access between rich and poor countries complicate booster strategies.

Purpose of the Study:

• To review and analyze existing data on the benefits and risks of frequent mRNA vaccine boosters.
• To address questions regarding the optimal timing, eligibility, and impact of booster doses on population immunity against COVID-19.
• To compare booster policies in high-income versus low-income countries.

Main Methods:

• Mini-review of published literature.
• Analysis of data on mRNA vaccine booster effectiveness and safety.
• Comparative assessment of global booster vaccination strategies.

Main Results:

• Evidence on the effectiveness, safety, and optimal frequency of COVID-19 boosters remains limited.
• The optimal timing and eligibility criteria for booster doses require further investigation.
• Significant disparities exist in booster dose access between high-income and low-income nations.

Conclusions:

• The widespread implementation of COVID-19 booster programs warrants cautious consideration due to insufficient evidence.
• Further research is crucial to establish optimal booster strategies that maximize population immunity and minimize risks.
• Addressing global vaccine equity is essential for effective pandemic control.