Progress towards poliomyelitis eradication -- Pakistan, January 2020--July 2021. - Mbaeyi, Chukwuma; Baig, Shahzad; Khan, Zainul; Foung, Hamish; Kader, Millhia; Jorba, Jaume; Safdar, Muhammad Rana; Jafarig, Hamid; Franka, Richard (Weekly Epidemiological Record, 2021)