Rapid action is needed in every region of the world to get countries back on track in the global fight against measles, amid a projected near-doubling in the number of cases, since 2017.

That’s according to Dr Katherine O’Brien from the World Health Organization (WHO), who stressed that the existing double-dose vaccination has proved to be extremely effective – and safe - since it was introduced 50 years ago.

Here she is speaking to Sarah Mbengue from UN News in Geneva.