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The chief medical adviser to the UK's Health Security Agency has warned of a long and difficult winter if people don't get their booster jabs for Covid-19.
Dr Susan Hopkins was speaking to the BBC's Andrew Marr.
The chief medical adviser to the UK's Health Security Agency has warned of a long and difficult winter if people don't get their booster jabs for Covid-19.
Dr Susan Hopkins was speaking to the BBC's Andrew Marr.