1. Institute of Medicine (1988) An evaluation of poliomyelitis vaccine policy options. Washington, DC: National Academy of Sciences (Publication No. IOM 88-04)
2. de Quadros CA, Andrus JK, Olive JM, de Macedo CG, Henderson DA (1992) Polio eradication from the Western Hemisphere. Ann Rev Publ Health 13: 239–252
3. Ogra PL, Karzon DT (1971) Formation and function of poliovirus antibody in different tissues. Prog Med Virol 13: 156–193
4. Paul JR, Riordan JT, Melnick JL (1951) Antibodies to three different antigenic types of poliomyelitis virus in sera from North Alaskan Eskimos. Am J Hygiene 54: 275–285
5. Sabin AB (1952) Transitory appearance of type 2 neutralizing antibody in patients infected with type 1 poliomyelitis virus. J Experiment Med 96:99–106