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Health chiefs issue 'don't delay' plea for COVID-19 vaccinations ahead of summer | North East and North Cumbria NHS
Fourth COVID-19 vaccine dose provides stronger immunity boost than third dose, shows UK study — Oxford Vaccine Group
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COVID vaccinations: questions and answers about the rollout in North Yorkshire - NHS North Yorkshire CCG
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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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