- Primary vaccinations and boosters effective in reducing COVID-19 severity during Delta and Omicron predominance News-Medical.Net
- COVID-19 vaccines protect against severe outcomes but less so over time CIDRAP
- 'Breakthrough' Infections After COVID Vaccine Can Help Prevent Future Illness U.S. News & World Report
- Study examines the incidence of severe COVID-19 in fully vaccinated and boosted high-risk populations News-Medical.Net
- Vaccines, Booster Shots and Prior Infections Reduce Risk and Severity of Future COVID-19 Infections, Study Finds The Weather Channel
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