Football supporters travelling to Euro may be at risk of catching measles.
Significant outbreaks are occurring in Switzerland and Austria, the two countries hosting the competition this summer.
A team of vaccine experts is currently conducting a risk assessment in Austria just eight weeks before the tournament.
The experts warned people to make sure they are vaccinated against the highly contagious disease.
Figures from the European Centre for Disease Prevention and Control (ECDC) show more than 1,300 measles cases were reported across Europe in the first quarter of 2008, compared to less than 800 in the same period last year.
Significant outbreaks have occurred recently in several European countries, so the risk to the millions of unvaccinated Europeans is real