Warnings of global child health crisis as tens of millions miss vaccinations

Children receive vaccines against measles and polio as part of a campaign launched with the support of Unicef in Sana’a, Yemen. Photograph: Anadolu Agency/Getty Images

Experts are warning of a “child health crisis” as new research reveals one of the largest ever sustained reversals in global vaccination coverage.

Tens of millions of children are vulnerable to preventable diseases as immunisation rates have continued to fall since Covid-19, according to UN figures.