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Infection with SARS-CoV-2, the virus that causes COVID-19, appears to be highly contagious and is primarily spread by droplets. Containment efforts have emphasized quarantine during the incubation period as the most effective measure to limit spread. Because of the personal and economic toll of this measure and its implication for transmission, we need to maximize our understanding of the incubation period. These authors studied the case records of 181 patients (median age, 44.5 years; 60% male) who had visited Wuhan, the city in China where the infection was first identified (161 cases), or been in contact with an infected person before becoming symptomatic and testing positive for COVID-19 between January 4 and February 24, 2020. The inve…