- COVID-19 protection increases after fourth vaccine dose but declines quickly News-Medical.Net
- Dynamics of humoral and T-cell immunity after three BNT162b2 vaccinations in adults older than 80 years The Lancet
- Protection by a Fourth Dose of BNT162b2 against Omicron in Israel | NEJM nejm.org
- Israeli research confirms BNT162b2 booster's effectiveness News-Medical.Net
- Fourth Vaccine Dose: Second Pfizer Booster Shot Increases Protection in Study Bloomberg
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