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Update on Vaccine-Derived Polioviruses - Worldwide, January 2017-June 2018.
Jorba J, Diop OM, Iber J, Henderson E, Zhao K, Sutter RW, Wassilak SGF, Burns CC.
MMWR Morb Mortal Wkly Rep. 2018 Oct 26;67(42):1189-1194. doi: 10.15585/mmwr.mm6742a5.
https://www.cdc.gov/mmwr/volumes/67/wr/mm6742a5.htm