Progress in vaccinating children against a variety of life-threatening diseases has stalled in the past two decades - and even gone backwards in some countries - a new global study suggests.
The situation has been made worse by the Covid pandemic, leaving millions of children unprotected from diseases such as measles, tuberculosis and polio.
The researchers are calling for a concerted effort to provide better and more equal access to vaccines.
Child health experts warn that cuts to international aid budgets that fund vaccination programmes, combined with vaccine scepticism, are creating a "perfect storm".
The global childhood vaccination programme has been a huge success.
