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Fourth Covid jab can give higher immunity than initial booster, study finds | Vaccines and immunisation | The Guardian
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Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study | NIHR
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Israeli study shows five-fold antibody rise with fourth COVID jab | Coronavirus pandemic News | Al Jazeera
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study — Oxford Vaccine Group
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