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The first data on the UK Covid vaccine rollout suggests it is having a “spectacular” impact on stopping serious illness, researchers say.

Within weeks, one shot reduces the risk of being admitted to hospital by at least three-quarters for the over 80s.

Researchers said this was particularly impressive as this age group was the most frail and least likely to have a strong immune response.

Monitoring of health staff also shows vaccination helps cut transmission.

So far a third of adults have received a vaccination in the UK.