Polish Health Minister Lukasz Szumowski has said that the ministry is working over regulations forbidding unvaccinated foreigners from third countries from entering Poland.

Moreover, the minister is considering, along with the Foreign Ministry, a possibility of banning entrance to Poland for unvaccinated citizens of the EU, Poland In English wrote.

"However, this is a delicate matter, because freedom of people's movement is in force in the EU," the minister told the "Rzeczpospolita" daily.

Read alsoMeasles in Ukraine: 755 additional cases reported in past week

In recent weeks, as many as 18 cases of people affected with measles were recorded in the Mazowieckie province in central Poland alone. According to authorities, the majority of the confirmed cases of measles concern foreigners, most likely from Ukraine.

The Main Sanitary Inspector stressed that his office is working together with Interior Ministry over "a rational regulation" in this matter.

The 18th case of measles was confirmed on Monday morning in Pruszkow county, some 15km of Warsaw city center.

In 2017, authorities recorded 59 cases of measles in Poland, while by October 2018, the number had risen to 144.