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Interval between onset of symptoms in the index case and onset of symptoms in household contacts with severe acute respiratory syndrome coronavirus 2 (serial interval) by HIV status of the index case, Klerksdorp and Soweto, South Africa, 2020–2021 (n = 69). Arrow indicates cutoff for inclusion in analysis for factors associated with serial interval duration. Abbreviations: BMI, body mass index; Ct, cycle threshold; HIV, human immunodeficiency virus.
