He told a media briefing today that data compiled by a SPI-M, which is a subgroup of the Scientific Advisory Group for Emergencies (Sage) suggests we are facing a third wave.
Boris Johnson is due to make a decision on Monday on whether England can go ahead with full reopening on June 21.
Reports have suggested he may take a mix and match approach, allowing big weddings to go ahead but forcing night clubs to stay shut.
Asked if delaying the road map date would make a difference, Prof Ferguson said: ‘Yes, because it allows more people to get second doses.’
He said efficacy for the second dose against the variant first identified in India was higher than after one dose.
He said any third wave of cases ‘will translate, by definition, into some number of hospitalisations and deaths’ but added that it is ‘harder to pin down quite how significant the latter will be at the current time’.
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