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COVID-19 (Coronavirus Disease 2019) is a respiratory infection caused by SARS-CoV-2, a virus related to the cause of SARS. This variant arose in 2019 in China near the city of Wuhan and quickly spread globally to cause the most significant pandemic since AIDS. Rapid sequencing of its genome and development of rapid diagnostic testing and a COVID vaccine within one year of the start of the outbreak have slowed the spread and reduced mortality, but frequent mutations give rise to novel strains of COVID which necessitate continued vigilance and updated booster shots.
COVID-19 variants that have been identified in the past 3 years include alpha, beta, gamma, delta and omicron variants. Omicron variants include BA.1, BA.2, BA.3, BA.4 and BA.5 as well as recombinant (XE) strains.