1. Brown F (ed) (1990) Modern approaches to vaccines. In: Seminars in Virology ,1: 1–74
2. Burke KL, Almond JW, Evans DJ (1991) Antigen chimeras of poliovirus. Prog Med Virol 38:56-68
3. Centers for Disease Control (1990) Progress toward eradicating poliomyelitis from the Americas. MMWR 39: 557–561
4. Chumakov KM, Powers LB, Noonan KE, Robinson IB, Levenbook IS (1991) Correlation between amount of virus with altered nucleotide sequence and the monkey test for acceptability of oral poliovirus vaccine. Proc Natl Acad Sci USA 88: 199–203
5. da Silva EE, Pallansch MA, Holloway BP, Oliveira MJC, Schatzmayr HG, Kew OM (1991) Oligonucleotide probes for the specific detection of the wild poliovirus types 1 and 3 endemic to Brazil. Pediatr Inf Dis J 19: 222–229