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Countries along the refugee travel route from Greece to central Europe have taken new measures to stem the flow of people in recent months.

As those measures took effect, a bottleneck was created in Greece.

The European Union is scrambling to deal with the pressure created by the continued influx of refugees and varying national policies aimed at deterring people from coming to the region.Leaders will meet next week at a summit in Brussels to hammer out a deal that may include returning migrants and refugees to Turkey for settlement.Part of the plan would be to resettle a Syrian refugee living in Turkey for every person relocated there from Greece.A child closes a tent, backdropped by a banner placed on the enforced razor wire fence between Macedonia and Greece that reads "Made in EU" during a rainfall at the northern Greek border station of Idomeni.(AP Photo/Vadim Ghirda) Macedonia today shut its border to the 40,000 migrants camped out along its border with Greece.

Tensions remain high as asylum-seekers, mostly from Syria and Iraq, are trying to make their way through Macedonia and on to Europe.

People waiting to cross have spent weeks in an ad-hoc camp where unsanitary conditions are raising health concerns.

Greek authorities are now trying to encourage people to leave the camps, especially the more than 14,000 people gathered at the northern Idomeni border crossing.

Heavy rains in the region are increasing the risk that infectious diseases could spread, health officials have warned.

The Greek state health authorities sent a pair of mobile vaccine units to help protect children at the border.

“We are monitoring the situation and are here to take the necessary measures,” said Athanassios Giannopoulos, head of the Hellenic Centre for Disease Control & Prevention (Keelpno), to told reporters.