SIEGFRIED, N L et al. SARS-CoV-2 Transmission Risk in the School Environment: a pilot case-ascertained prospective study to inform future school-based surveillance. . South African Medical Journal, South Africa, v. 113, n. 5, p. 30–38, 2023. DOI: 10.7196/SAMJ.2023.v113i5.16736. Disponível em: https://samajournals.co.za/index.php/samj/article/view/835. Acesso em: 19 nov. 2025.