Africa has seen a dramatic rise in measles cases of up to 700%, the World Health Organization (WHO) has confirmed.
The UN agency also said the number of cases reported globally in the first three months of 2019 has tripled, compared to the same period last year.
Provisional data shows a clear trend, with all regions of the world seeing outbreaks, and the numbers could be higher since only one in 10 cases globally are reported, the WHO says.
Madagascar, India and Ukraine have been the worst hit by the highly infectious viral illness, with tens of thousands of cases reported per million people.
WHO says since September 2018 at least 800 people have died from measles in Madagascar alone.
Measles can lead to serious health problems such as infections of the brain and lungs.