摘要：What is already known about this topic? After certification of eradication of wild poliovirus type 2 in 2015, World Health Organization Member States committed to contain all poliovirus materials safely. What is added by this report? Twenty-six countries have designated 74 poliovirus type 2 poliovirus-essential facilities to retain poliovirus type 2 materials; these countries need to begin the certification process before the end of 2019. Upon certification of wild poliovirus type 3 eradication and expanded manufacture of monovalent oral poliovirus type 2 to combat ongoing vaccine-derived poliovirus type 2 outbreaks, the number of designated poliovirus-essential facilities will increase. What are the implications for public health practice? After the world is certified polio-free, all poliovirus serotypes ultimately will require secure containment because any release into communities could result in widespread transmission.
