By Kate Kelland LONDON (Reuters) - Vaccinating only Syrian refugees against polio may not be enough to prevent the crippling viral disease from re-infecting Europe where it has not been seen for decades, German scientists warned on Friday. Writing in The Lancet medical journal, they said the risk to Europe from a re-emergence of polio in Syria was partly due to the type of vaccine generally used in regions that have not had the disease for many years. Polio, caused by a virus transmitted via contaminated food or water, was confirmed among young children in northeast Syria last month - its first appearance there in 14 years. The World Health Organization (WHO) said the virus probably spread from Pakistan - one of three countries where polio is still endemic - and warned that Syria's outbreak posed a threat to millions of children across the Middle East.
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