Abstract Background The Oral Polio Vaccine (OPV or Sabin) is genetically unstable and may mutate to form vaccine-derived polioviruses (VDPVs). Methods In 2014. two VDPVs type 2 were identified during routine surveillance of acute flaccid paralysis (AFP) cases. Consequently. https://www.foldlyers.shop/product-category/gadgets-and-gizmos/