1. Eradication of poliomyelitis in the United States II: experience with killed poliovirus vaccine;Salk;Rev Infect Dis,1980
2. Perspectives on current use of some virus vaccines in the USA. Measles, rubella, poliomyelitis, and influenza in the USA: contrasts in control by vaccination;Sabin;Pediatr Res,1979
3. Wild poliovirus type 1 and type 3 importations—15 countries, Africa, 2008–2009;MMWR Morb Mortal Wkly Rep,2009
4. Survey of poliovirus antibodies during the final stage of polio eradication in Egypt;El-Sayed;Vaccine,2007
5. Antibody levels against polioviruses in children following Pulse Polio Immunization Program;Hasan;Indian Pediatr,2004