Polio's moving target
In 2012 Ewen Callaway travelled to Northern Nigeria to learn more about the global polio eradication effort. We join him on the search to find one of the virus' last remaining strongholds in remote nomadic communities that the vaccines couldn't reach.
Read Ewen's feature here: http://dx.doi.org/10.1038/496290a
Read Ewen's feature here: http://dx.doi.org/10.1038/496290a
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