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==poliovirus==
*family ''Picornaviridae'', genus ''Enterovirus''
*cVDPV3 is not identified so far
*duration of activity VDPV is relatively physically stable in environment/sewage*how to but cannot keep activity infectivity not for long time, thus continuous detection of VDPV in environmentenviromnent means continuous transmission and/sewageor excretion of VDPV from people living in the community*where the sabin virus obtains mutation to distribution of breech (disinfectant) and/or irradication ultraviolet light may be effective against PV/VDPV*threshold of immunization coverage to maintain PV/VDPV freeis 85-90%
==Global Polio Eradication
**⇔Variola cases and true smallpox infection overlapped almost identically
*novel OPV2
**using genetically modified stain
**more stabilized genomically
==clinical==
