Measles is mostly spread through direct contact or in the air and causes symptoms including fever, muscle pain and a skin rash on the face and upper neck. Most measles-related deaths are caused by complications including swelling of the brain and dehydration. The WHO says serious complications are most serious in children under five and adults over 30.
More than 95% of measles deaths occur in developing countries, mostly in Africa and Asia. There is no specific treatment for measles, but the two-dose vaccine against it is about 97% effective in preventing severe illness and death.
In July, the U.N. said 25 million children have missed out on routine immunizations against diseases including diphtheria, largely because the coronavirus disrupted routine health services or triggered vaccine misinformation.