Prime Minister Boris Johnson in February lifted the last coronavirus restrictions in England and abolished a legal requirement to self-isolate after testing positive for the virus.
But while prevalence fell in under-17s and 18-54-year-olds during February, for those 55 and older, it was estimated to have increased over the month. Britain has announced a spring booster will be offered to over-75s and some other vulnerable groups as a precaution in case waning immunity from the initial booster lowers protection against severe disease.
Booster immunity waning and natural immunity intact
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