Around 117 million children worldwide risk contracting measles because dozens of countries are curtailing their vaccination programmes as they battle COVID-19, the United Nations warned on Tuesday.
Currently 24 countries, including several already dealing with large measles outbreaks, have suspended widespread vaccinations, the World Health Organisation and the UN's children's fund UNICEF said.
An additional 13 countries have had their vaccination programmes interrupted due to COVID-19.
In a joint statement, the Measles and Rubella Initiative (M&RI) said it was vital that immunisation capacity was retained during and after the current pandemic.
"Together, more than 117 million children...could be impacted by the suspension of scheduled immunization activities," it said.
"The M&RI supports the need to protect communities and health workers from COVID-19 through a pause of mass campaigns, where risks of the disease are high. However, this should not mean that children permanently miss out."
"We are therefore urging countries to prepare and plan now for intensive catch-up vaccinations once physical distancing restrictions are lifted."