Covid-19 in familial cluster: ultrashort incubation period could be an early indication of Brazilian Variant of SARS-Cov-2 virus? Acervo Saúde [Internet]. 2021 Apr. 27 [cited 2026 Nov. 3];13(4):e6726. Available from: https://acervomais.com.br/saude/article/view/6726