Dr. Ambreen Chaudhr, a National Stop Transmission of Polio (N-STOP) Field Epidemiology and Laboratory Training Program (FELTP) officer, checks for finger marks to verify vaccination status of nomad children for oral polio vaccine (OPV) near the Sind and Punjab provinces border in Pakistan on November 12th, 2014. Submitted by Ambreen Chaudhry – Pakistan.
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