“Covid-19 in Familial Cluster: Ultrashort Incubation Period Could Be an Early Indication of Brazilian Variant of SARS-Cov-2 Virus?”. Electronic Journal Collection Health 13, no. 4 (April 27, 2021): e6726. Accessed November 3, 2026. https://acervomais.com.br/saude/article/view/6726.