![]() ![]() By March 16, the outbreak had led to >170,000 total confirmed cases and >6,500 deaths globally. By January 21, most provinces of China had reported COVID-19 cases. On January 8, 2020, the pathogen was identified ( 1), and human-to-human transmission was reported soon after. Initially, 41 cases of “pneumonia of unknown etiology” were reported to the World Health Organization by the Wuhan Municipal Health Committee at the end of December 2019 ( 2). Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the etiologic agent of the current rapidly growing outbreak of coronavirus disease (COVID-19), originating from the city of Wuhan, Hubei Province, China ( 1).
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