Beginning in December 2019, a small cluster of cases of a pneumonia of unknown origin were reported in Wuhan, Hubei Province, China. Genetic sequencing of samples taken from the respiratory tract secretions of those exhibiting the suspicious pneumonia revealed the causative agent as a previously unknown coronavirus initially named the 2019-nCoV virus (the "n" indicating a novel coronavirus). The virus was subsequently named SARS-CoV-2 (also styled SARS-CoV2). The disease caused by the virus is designated COVID-19.
Case counts grew rapidly in China and by January 2020 the virus spread to other countries. On March 11, 2020, the World Health Organization (WHO) officially declared COVID-19 a global pandemic. As the pandemic took hold, the United States quickly surpassed the early record...Read more