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Effectiveness of heterologous third and fourth dose COVID-19 vaccine schedules for SARS-CoV-2 infection during delta and omicron predominance in Thailand: a test-negative, case-control study - The Lancet Regional Health - Southeast Asia
Department of Health and Social Care on Twitter: "Data from @UKHSA shows that a #COVID19 booster vaccine provides 88% protection against hospital admission from the #OmicronVariant. The booster jab is the best
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UK Volunteers to receive Moderna Omicron COVID-19 booster vaccine in study led by St George's, University of London - St George's University Hospitals NHS Foundation Trust
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Novavax expected to be become fourth Covid vaccine available in UK | Vaccines and immunisation | The Guardian
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study — Oxford Vaccine Group
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