In conclusion, the SARS-CoV-2 infection induced lymphopenia but increased HFLs. The HFLs level might be correlated with disease severity in patients with COVID-19. Given that HFLs can be conveniently counted by a haematology analyser, it might be a useful parameter for clinical monitoring and mechanism studies of COVID-19. Studies based on larger samples are warranted to confirm our present finding.
Author contributionsZhao Wang and Zhaoming Tang conceived the study and wrote the paper. Yu He and Huaqing Shu analysed the data and wrote the paper. Ping Wang, Hui Xing and Xiaoqian Zeng collected the data.
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