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Nature 411, 405 (24 May 2001) | doi:10.1038/35078219

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Plans to eradicate polio hit by virus outbreak in Bulgaria

Mark Schrope

Two new cases of poliomyelitis in Bulgaria threaten to delay plans by the World Health Organization (WHO) to eradicate the disease from the planet. The cases raise particular concern because they are caused by a wild virus, rather than by the strain used in vaccinations.