By DANICA KIRKA and JILL LAWLESS Associated Press LONDON (AP) — Britain's health chief has hailed a new study suggesting that a single dose of the Oxford-AstraZeneca COVID-19 vaccine provides a high level of protection for 12 weeks, saying it supports the government's contentious strategy of delaying the second shot so it can protect more people quickly with a first dose. Britain's decision has been criticized as risky by other European countries, but Health Secretary Matt Hancock said Wednesday that the study 'backs the strategy that we've taken and it shows the world that the Oxford vaccine works effectively.' Hancock's […]
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