摘要：What is already known about this topic? Wild poliovirus (WPV) transmission has not been interrupted in Afghanistan, Nigeria, and Pakistan. Rare circulating vaccine-derived poliovirus (cVDPV) outbreaks can occur in areas with low oral poliovirus vaccination coverage. What is added by this report? No WPV cases have been detected in Nigeria since 2016. WPV transmission has continued in Afghanistan and Pakistan in all previously identified reservoirs. The number and extent of cVDPV outbreaks increased in 2018. Countries with endemic polio have revised emergency action plans to innovate and intensify strategies to reach and vaccinate every child in underimmunized populations. What are the implications for public health practice? Successful implementation of locally relevant strategies in all areas will be essential to interrupting WPV transmission.
