Elderly people who have received only one vaccine dose appear in some cases to still be vulnerable to the disease. These findings have fuelled growing concerns about the government’s strategy of delaying administering the second dose to care home residents – sometimes by as much as 12 weeks – as opposed to administering the second dose after three weeks as recommended.

According to Professor Martin Vernon, a consultant geriatrician in Greater Manchester and former National Clinical Director for Older People for NHS England, there have been cases of older care home residents coming down with the virus after being vaccinated with the Pfizer vaccine. “I have sight of a reasonably large system of care homes. In just under 20 per cent of them I have experienced outbreaks in the 31 days since vaccination. None of them have received second doses.”