Thirty cases of circulating vaccine-derived poliovirus type 2 have been recorded so far in Nigeria in 2022, The PUNCH reports. The figure is contained in the report of the Global Polio Eradication Initiative obtained by our correspondent on Sunday. The report showed that there is one cVDPV2 positive environmental sample reported in Zamfara State. “No case of circulating vaccine-derived poliovirus type 2 (cVDPV2) was reported this week. The number of cases in 2022 remains 30. There were 415 cases reported in 2021. One cVDPV2 positive environmental sample was reported in Zamfara,” the report read. The PUNCH reports that Nigeria recorded 415 cases of cVDPV2 in 2021. There are three types of cVDPV − types 1, 2, and 3, with type 2 currently causing the vast majority of cases. cVDPV is a rare, circulating virus mutated from the weakened virus contained in the oral polio vaccine, which can only emerge in under-immunised populations. According to the GPEI, “if a population is seriously under-immunised, there are enough susceptible children for the excreted vaccine-derived polioviruses to begin circulating in the community. If the vaccine virus can circulate for a prolonged period uninterrupted, it can mutate and, over 12-18 months, reacquire neurovirulence. These viruses are called circulating vaccine-derived polioviruses. View More…