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When the Global Polio Eradication Initiative (GPEI) began in 1988, cases of poliomyelitis were reported from 125 countries. Currently, only Afghanistan, Nigeria and Pakistan have never interrupted wild poliovirus (WPV) transmission. The primary means of detecting poliovirus is surveillance for acute flaccid paralysis (AFP) among children aged< 15 years, by testing stool specimens for WPV and vaccine-derived polioviruses (VDPVs) in WHO-accredited laboratories in the Global Polio Laboratory Network (GPLN).(1, 2) AFP surveillance is supplemented by environmental surveillance for polioviruses in sewage at selected locations. Analysis of the genomic sequences of isolated polioviruses enables assessment of transmission by time and place, potential gaps in surveillance and emergence of VDPVs.(3) This report presents data from surveillance of poliovirus for 2017-2018 in the 31 countries (4) in which polio is …