People in the U.K. were on high alert as measles outbreaks hit the country's two major cities of Leeds and Liverpool.

Listing symptoms of the highly contagious infection, including high fever, red eyes, coughing, and a red brown rash, the National Health Service (NHS) advised people to stay at home and call a doctor if they suspect they could have been infected.

According to the head of immunization at Public Health England Dr. Mary Ramsay, the measles cases in Leeds and Liverpool were "two separate localized outbreaks."

"All of the cases we are seeing are in children and young adults who haven't received the [Measles, Mumps, and Rubella] MMR vaccine. Due to ongoing measles outbreaks within Europe, we will continue to see imported measles cases in the U.K. in unimmunized individuals," Dr. Ramsay said.

She added that the ongoing outbreaks were an important reminder for parents to vaccinate their children.

Meanwhile, doctors in Manchester are reportedly worried that measles might hit their region next.

Earlier this year, measles outbreaks killed 35 people in several European countries, including Italy, Germany and Romania, where most of the fatal cases were recorded.