Abstract
After Switzerland switched from inoculating children with the live-attenuated oral polio vaccine (OPV or Sabin) to the inactivated polio vaccine (IPV or Salk), analysis proved that samples from Swiss wastewater treatment plants tested positive for at least 3 years for Sabin-like poliovirus strains, including virulent revertants, according to Alfred Metzler of the University of Zurich, Switzerland. These findings reinforce the notion that polio vaccination programs should continue for many years, even in countries where the disease itself seldom, if ever, occurs. Details of the research appear in the September Applied and Environmental Microbiology (74:5608–5614).
Published Version
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