A cocktail of three flu viruses are reported to have mutated into a single pneumonic plague, which it is believed may be far more dangerous than swine flu. The death toll has reached 189 and more than 1 million people have been infected, most of them in the nine regions of Western Ukraine.

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Russia, Slovakia, Poland, Hungary and Romania, countries that border Ukraine, have already launched health checks on Ukrainians entering their territory.

Slovakia has closed two of five border crossings.

A doctor in Western Ukraine who did not want to be named, said:” We have carried out post mortems on two victims and found their lungs are as black as charcoal.

“They look like they have been burned. It’s terrifying.”