FILE - In this Wednesday, Feb. 17, 2021 file photo, Britain's Prime Minister Boris Johnson holds a vial of the Oxford/Astra Zeneca Covid-19 vaccine at a vaccination centre in Cwmbran, south Wales. The British government says it aims to give every adult in the country a first dose of coronavirus vaccine by July 31, a month earlier than its previous target. In addition, the goal is for everyone over 50 or with an underlying health condition to get a shot by April 15, rather than the previous target of May 1. (Geoff Caddick/Pool via AP, File)
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