"... Risk Factors for VDPV Emergenceposted by paulsc at 7:54 AM on April 24, 2008
The overriding factor for the emergence of all VDPVs is the same as for wild poliovirus (WPV) circulation, low immunity levels in a population. Where routine coverage with OPV is poor or where there is an absence of high quality supplementary immunization activities, a population can become susceptible to the emergence of VDPV. This is because the virus has time to change, replicate and exchange genetic material with other enteroviruses, while spreading through a population.
Importantly, if a population is fully immunized against polio, it will be protected against the spread of both wild and vaccine strains of poliovirus."
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posted by srboisvert at 2:18 AM on April 24, 2008 [20 favorites]