摘要
Three research papers were published recently to compare the virological properties of the Omicron variant with the earlier variants of concern(VOC).1,2,3 The SARS-CoV-2 B.1.1.529 variant,Omicron,was first detected in South Africa in October 2021 and has spread rapidly;within three months,it appeared in more than 87 countries.4 During the surveillance of the epidemiological data and mutations of earlier COVID-19 variants and Omicron,significant differences were revealed mainly in the reproduction rate and hospitalization.
