ELISA, Enzyme-linked immunosorbent assay; NR, not reported, PCR, polymerase chain reaction; VAPP, vaccine-associated paralytic polio; VPD, vaccine preventable disease; VDPV3, vaccine-derived poliovirus type 3; pWPV1, wild poliovirus 1; WPV2, wild poliovirus 2; WPV3, wild poliovirus 3. Diphther...