London/Manila — Britain gave AstraZeneca’s Covid-19 vaccine a vote of confidence on Friday when it asked its regulator to assess the shot for a rollout. That was after experts raised questions about trial data and the company said it may run another study to gauge efficacy.

The UK government has secured 100-million doses of the vaccine, developed by AstraZeneca and Oxford University, the most it has ordered of any shot to fight a pandemic that has killed more than 1.4-million people globally...

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