Second shots of Covid vaccine could be delayed further in England

Evidence growing that spacing doses of Pfizer vaccine improves effectiveness

Second shots of coronavirus vaccine could be delayed even further amid growing evidence that spacing out the doses improves their effectiveness.

The NHS vaccination programme aims to immunise about 14 million people at greatest risk of Covid by mid-February with second doses due to be given up to 12 weeks later.

Related: Vaccine supply is holding back jabs programme, says Matt Hancock

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