Hutzler RU, Fujita M, Waldman EA, et al. Neutralizing antibodies for poliovirus in newborn children sera before and after mass immunization of Brazilian population from one to five years old, São Paulo — Brazil, 1980 . Rev. Inst. Med. Trop. São Paulo. 1984;26(2):78-82. Accessed May 27, 2024. https://www.revistas.usp.br/rimtsp/article/view/87257