[1] Ctr Dis Control & Prevent, Ctr Global Hlth, Global Immunizat Div, Atlanta, GA 30333 USA
[2] Afghanistan Minist Publ Hlth, Directorate Gen Prevent Med, Kabul, Afghanistan
[3] Off Minist Advising President Hlth & Educ Affairs, Kabul, Afghanistan
[4] Natl Focal Point Polio Eradicat, Kabul, Afghanistan
[5] Ctr Dis Control & Prevent, Kabul, Afghanistan
[6] WHO, Polio Eradicat Unit, Kabul, Afghanistan
[7] United Nations Childrens Fund, Polio Eradicat Unit, Kabul, Afghanistan
[8] United Nations Childrens Fund, Commun Program, New York, NY USA
[9] Pakistan Polio Reg Reference Lab, Islamabad, Pakistan
[10] WHO, Reg Off Eastern Mediterranean, Cairo, Egypt
[11] Ctr Dis Control & Prevent, Natl Ctr Immunizat & Resp Dis, Atlanta, GA 30333 USA