According to the World Health Organization (WHO), the number of reported measles cases worldwide tripled in the first three months of 201
The UN organization said preliminary data pointed to "a clear trend", with outbreaks occurring in all regions of the world.
In Africa, the most dramatic increase was 700%.
The agency said the actual numbers could be much larger, as it is reported worldwide in only one in ten cases
Measles are a highly contagious viral disease that can sometimes lead to serious health complications, including lung and brain infections ,
Ukraine, Madagascar and India are the most affected by the disease, with tens of thousands of people reported cases per million people.
At least 800 people have died from measles in Madagascar alone since September.
Outbreaks have also hit Brazil, Pakistan and Yemen, "many deaths – especially among young children".
A sp In addition, the number of cases in countries such as the USA and Thailand that have high levels of vaccine coverage has been reported.
The UN says that with the right vaccines, the disease is "completely preventable" but globally the first vaccine phase covers 85% "stalled", "still just under 95% to prevent outbreaks".
Why the sudden "global measles crisis"?
By James Gallagher, Health and Science Correspondent, BBC News
It is one of the most contagious viruses, but measles has not changed. It does not mutate to become more contagious or dangerous, instead the answers are quite human.
There are two stories here – one of poverty and one of misinformation. In poorer countries fewer people are vaccinated and a larger part of the population remains susceptible to the virus.
This creates the environment for a major eruption – for example in the Democratic Republic of Congo, Kyrgyzstan and Madagascar.
But also in the rich countries with seemingly high vaccination rates there is an increase in cases. This is because groups of people decide not to vaccinate their children because false anti-Vax messages are being spread on social media.
It is worth noting that these numbers are preliminary, the WHO says the true numbers would be much higher. And measles is anything but harmless. It kills around 100,000 people every year, mostly children.
In a statement for CNN, WHO leaders Henrietta Fore and Tedros Adhanom Ghebreyesus said that "the dissemination of confusing and contradictory information" about vaccines is partly responsible.
"It's understandable how loving the climate is Parents may feel lost," they said, adding, "ultimately there is no" debate "about the profound benefits of vaccines."
"Since then More than 20 million lives have been saved by measles vaccination in 2000 alone. "
In response to the outbreak of measles, demands were made in several countries for compulsory vaccination.
Last month, Italy banned children under the age of six from attending schools, unless they had chickenpox vaccines, measles and other people receiving illness.
In the area of New York, a public health emergency has been called, condemning all residents for vaccination or a fine.