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To ask Her Majesty's Government what estimate they have made of the duration of protection from COVID-19 provided by (1) the Oxford/AstraZeneca, and (2) the Pfizer/BioNTech, vaccine; and what estimate they have made of the length of time a person who receives (a) only a first dose, and (b) two doses, of (i) the Oxford/AstraZeneca and (ii) the Pfizer/BioNTech, vaccine is protected from COVID-19.
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