Measles returns to four European nations, WHO says

Measles has returned to four European nations previously seen as free of the illness, according to the World Health Organization (WHO).

The disease is no longer considered eradicated in Albania, the Czech Republic, Greece and the UK.

"We are backsliding, we are on the wrong track," said Kate O'Brien of the WHO's Immunization Department.

Measles is a highly contagious and potentially fatal illness that causes coughing, rashes and fever.