The virus spread rapidly around the world and was declared a pandemic by the World Health Organization (WHO) on 11 March 2020, with many countries adopting unprecedented public health measures to curb its spread.Ĭoronaviruses are large, lipid-enveloped, single-stranded RNA viruses found in avian and mammalian species. In December 2019, reports emerged of a cluster of cases of pneumonia of unknown cause in Wuhan City, China, culminating in the identification of a novel coronavirus on 12 January 2020, denoted as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and the associated disease as coronavirus disease 2019 (COVID-19). (See Editorial Commentary by Creech on pages 2480–1.) Coronavirus, SARS-CoV-2, COVID-19, children, infection
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