Polio eradication – so close but still not there! Here is an excellent recent 2 page wrap up by Dr S. Naqvi, our senior registrar in Infectious Diseases and Microbiology. Polioviruses Naqvi 2020 tutorial
See also Circulating vaccine derived poliovirus – Papua New Guinea Disease outbreak news, 2 July 2018 (WHO)
Photo and table: Wikipedia