title: Vaccines: quality issues.
authors.affiliation: WHO-SEARO, New Delhi.
authors.forename: J
authors.initials: J
authors.lastname: Sokhey
authors.forename: S
authors.initials: S
authors.lastname: Sarkar
mesh_terms: D002648:Child; D002675:Child, Preschool; D003906:Developing Countries; D006801:Humans; D007194:India; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000592:standards; D023321:Poliovirus Vaccines / Q000592:standards*; D011786:Quality Control
chemical_list: D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines