Polio eradication is unusually demanding because success depends on repeatedly reaching almost every child in places where the virus is still circulating. That makes security around vaccination teams a public-health issue, not only a policing issue.
The World Health Organization said in August 2026 that wild poliovirus type 1 transmission continued in Afghanistan and Pakistan, the world’s two remaining endemic countries. It described the two countries as a single epidemiological bloc because the virus and populations move across the border.
When vaccinators or the police protecting them are attacked, the most immediate effect is access. Campaigns can be suspended, routes can be abandoned and families in high-risk districts may miss repeated vaccine doses.
The second effect is staffing. Health workers may be unwilling or unable to enter areas where colleagues have been killed. Security escorts can reduce risk but also require large numbers of personnel and can make campaigns more difficult to organise.
The third effect is surveillance. Eradication is not only about giving vaccine; health systems must also detect cases and test environmental samples. Border closures and insecurity can delay movement of samples and weaken the programme’s ability to see where the virus is circulating.
WHO’s 2026 emergency committee highlighted serious access and security challenges in southern Khyber Pakhtunkhwa and in parts of Afghanistan. It also condemned attacks on health workers and stressed that their safety is essential to eradication.
The biology of polio makes missed children especially important. The virus can spread silently, often without paralysis, so a small pocket of under-immunised children can sustain transmission even if national vaccination coverage looks high.
That is why one attack can have consequences beyond the immediate casualties. It can create a gap in vaccination and surveillance that the virus can exploit, and cross-border movement means such gaps can affect both Afghanistan and Pakistan.
Eradication therefore requires both medical tools and reliable access: vaccines, trusted community engagement, secure health workers, surveillance and coordination across the border.