| isolation of sabin-like polioviruses from wastewater in a country using inactivated polio vaccine. | from 2001 to 2004, switzerland switched from routine vaccination with oral polio vaccine (opv) to inactivated polio vaccine (ipv), using both vaccines in the intervening period. since ipv is less effective at inducing mucosal immunity than opv, this change might allow imported poliovirus to circulate undetected more easily in an increasingly ipv-immunized population. environmental monitoring is a recognized tool for identifying polioviruses in a community. to look for evidence of poliovirus circ ... | 2008 | 18641161 |