Kleynhans J, Walaza S, Martinson NA, Neti M, von Gottberg A, Bhiman JN, et al. Household transmission of SARS-CoV-2 from adult index cases living with and without HIV in South Africa, 2020-2021: a case-ascertained, prospective observational household transmission study. https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciac640/6655792?login=false