Measles is spreading across Europe wherever immunisation coverage has dropped, the World Health Organization is warning.
The largest outbreaks are being seen in Italy and Romania.
In the first month of this year, Italy reported more than 200 cases. Romania has reported more than 3,400 cases and 17 deaths since January 2016.
Measles is highly contagious. Travel patterns mean no person or country is beyond its reach, says the WHO.