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A handbook for building skills, Updated 2013
The occurrence of a case of wild polio in a previously polio free area as presently in Syria, whether through importation, laboratory accident, or mutation of vaccine virus (VDPV), should be considered a public health emergency, that requires a rapid and high quality response as utmost priority
Bulletin of the World Health Organization Volume 91, Number 4, April 2013, 237-312

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