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Progress towards Poliovirus Containment, Worldwide
From the Weekly Epidemiological Record
https://apps.who.int/iris/bitstream/handle/10665/328103/WER9439-en-fr.pdf
This comprehensive review also looks at trends in cVDPV2 outbreaks:
3 outbreaks in 2016, 4 in 2017, 6 in 2018 and 14 to date in 2019. Has the switch from tOPV to bOPV succeeded?