Africa declared free from wild polio - but vaccine-derived strains remain.

@article{Guglielmi2020AfricaDF,
  title={Africa declared free from wild polio - but vaccine-derived strains remain.},
  author={Giorgia Guglielmi},
  journal={Nature},
  year={2020}
}
No new cases of wild poliovirus have been recorded on the continent since 2016, but other types of the virus persist. No new cases of wild poliovirus have been recorded on the continent since 2016, but other types of the virus persist. 

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