The detection of 3 ambiguous type 2 vaccine-derived polioviruses (VDPV2s) in Uganda
Abstract Background The Oral Polio Vaccine (OPV or Sabin) is genetically unstable and may mutate to form vaccine-derived polioviruses Pièce Détachée (VDPVs).Methods In 2014, two VDPVs type 2 were identified during routine surveillance of acute flaccid paralysis (AFP) cases.Consequently, a retrospective VDPV survey was conducted to ensure that th