Vaccine associated paralytic poliomyelitis is defined as those cases of acute flaccid paralysis:

b. Who have residual weakness 60 days after the onset of paralysis and from whose stool samples, vaccine related poliovirus but no wild virus is isolated(Ref: IAP Guidebook on Immunization 2013-14; p 119)Vaccine associated paralytic poliomyelitis (VAPP) is defined as those cases of AFP which have residual weakness 60 days after the onset of paralysis and from whose stool samples, vaccine-related poliovirus but no wild poliovirus is isolated.