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This publication is available at https://www.gov.uk/government/publications/wuhan-novel-coronavirus-background-information/wuhan-novel-coronavirus-epidemiology-virology-and-clinical-features This page contains information for professionals and the public on the epidemiology, virology and clinical features of coronavirus (COVID-19), the infection caused by SARS-CoV-2.On 31 December 2019, the World Health Organization (WHO) was informed of a cluster of cases of pneumonia of unknown cause detected in Wuhan City, Hubei Province, China.