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Europe at 'polio risk' from Syria
http://www.bbc.co.uk/news/health-24854920Europe could be at risk from polio following a recent outbreak in Syria, infectious disease experts say.
In the Lancet journal, two doctors in Germany say the cases in Syria - which had been free of wild poliovirus since 1999 - could endanger nearby regions.
They say because only one in 200 people infected develops paralysis it could take a year of "silent transmission" before an outbreak is detected.
In that time hundreds of individuals could be carrying the infection.