COVID-19

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coronavirus (2019-ncov) coronavirus delta variant covid-19 epidemics and pandemics epidemiology health policy immune system infectious diseases (other) storytype:standard structure:news structure:news/uk-news topics:in-the-news/coronavirus topics:in-the-news/omicron-variant topics:things/booster-vaccines topics:things/vaccines vaccination and immunization vaccines and immunity

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booster 9 doses 9 new 9 vaccine 9 covid dose shot variant coronavirus need omicron vaccines biontech effective emerge far levels offer pfizer protection shots study trial variants virus year act akin astrazeneca authorized available based benefits boost boosters british charm claimed claims combating

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