Vaccine-derived type 1 polioviruses isolated from sewage in Japan included neurovirulent strains that were neutralized by sera from vaccinated humans and rats.
Vaccine-derived neurovirulent polioviruses can circulate in the environment where oral polio vaccine is used, although they remain susceptible to vaccine-induced immunity.
Sixteen type 1 poliovirus strains were isolated from a sewage disposal plant located downstream of the Oyabe River in Japan between October 1993 and September 1995. The isolates were intratypically differentiated as vaccine-derived strains. Neutralizing antigenicity analysis with monoclonal antibodies and estimation of neurovirulence by mutant analysis by PCR and restriction enzyme cleavage (MAPREC) were performed for 13 type 1 strains of these isolates. The isolates were classified into three groups. Group I (five strains) had a variant type of antigenicity and neurovirulent phenotype. Group II (four strains) had the vaccine type of antigenicity and neurovirulent phenotype. Group III (four strains) had the vaccine type of antigenicity and an attenuated phenotype. Furthermore, it was demonstrated that the virulent isolates were neutralized by human sera obtained after oral poliomyelitis vaccine (OPV) administration, and the sera of rats immunized with inactivated poliovirus vaccine. Although vaccination was effective against virulent polioviruses, virulent viruses will continue to exist in the environment as long as OPV is in use.
Horie et al. (Tue,) conducted a other in Type 1 Poliovirus. Vaccine-derived type 1 poliovirus strains was evaluated on Neurovirulence and neutralizing antigenicity. Vaccine-derived type 1 polioviruses isolated from sewage in Japan included neurovirulent strains that were neutralized by sera from vaccinated humans and rats.
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