摘要
The Omicron variant of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)was first confirmed in November 2021 in South Africa^([1])and is more transmissible than other sub-variants.^([2])The influence of Omicron in children has been recognized with increased hospital admission rate than Delta wave.^([3,4])But severe clinical outcomes and comorbidity of Omicron are less than Delta in children.^([5])Hospitalized children during the Omicron period were more likely to be younger than that in the pre-Omicron period.^([6])
基金
funded by the National Key Research and Development Program of China(Nos.2021YFC2701800 and 2021YFC2701801)
the Shanghai Municipal Science and Technology Major Project(No.ZD2021CY001).
