Pakistan began its second nationwide polio vaccination campaign of the year on Monday, targeting over 45 million children under the age of five before the drive concludes on April 19. More than 400,000 frontline health workers will conduct door-to-door visits across all provinces and territories, with the campaign also coordinated with neighbouring Afghanistan to prevent cross-border transmission of the virus. Officials say the effort comes at a critical moment: while the number of affected districts has fallen sharply from 82 in 2025 to 23 so far in 2026, one case has already been confirmed this year in Sujawal, Sindh, underscoring that full eradication remains unfinished.