Is polio in our sewage as worrying as it sounds? - The Guardian

Ian Sample speaks to epidemiologist Nicholas Grassly to find out how worried we should be about poliovirus in London sewage, and what it means for the global effort to eradicate polio.

Last week, public health officials declared a national incident after they found vaccine-derived poliovirus in London sewage samples. No cases of polio symptoms have been reported but there is eviden… [+330 chars]

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