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[Correspondence] Polio vaccination in Pakistan: by force or by volition?

In the Correspondence section, Hussain and colleagues1 praised an aggressive manoeuvre by the Pakistani Government to ensure polio vaccination in Pakistan by arresting parents who refused to vaccinate their children. In response, Khan and Ahmad2 noted that the main barriers to polio eradication in certain parts of Pakistan are public attitudes and misconceptions—ie, civilians in the northern tribal areas generally believe that vaccination programmes have been used by the USA to spy on militant groups.