South Africa regains polio-free status: Processes involved and lessons learnt. South African Journal of Child Health, [S. l.], v. 16, n. 2, p. 58–62, 2022. DOI: 10.7196/SAJCH.2022.v16.i2.1822. Disponível em: https://www.samajournals.co.za/index.php/sajch/article/view/64. Acesso em: 21 apr. 2026.