Major virus milestone reached but battle far from over.
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Clarke, T . WHO vaccinates 16 million. Nature Science Update www.nature.com/nsu/010705/010705-14.html (2002).
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Clarke, T. Europe declared polio free. Nature (2002). https://doi.org/10.1038/news020617-12
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DOI: https://doi.org/10.1038/news020617-12
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