Thousands of children across England are not fully protected against polio, with booster uptake lagging by 50 per cent in some parts of the country, government data show.
Some 101,737 children had not received a booster jab by their fifth birthday in 2020/21, out of a total of 693,928. Around a third of all these unprotected five-year-olds (34,105) were in London.
