Difference in Lymphocyte Subset Counts According to Disease Severity and SARS-CoV-2 Variants of Hospitalized COVID-19 Patients in Korea

The peripheral lymphocyte subset counts decreased according to disease severity and the types of SARS-CoV-2 variants in hospitalized COVID-19 patients. Despite the efficient operation of the national quarantine system and high vaccination rates in South Korea, it suggests that viral mutations evolve in a direction that further weakens the immune system. This is the only study on the difference in peripheral lymphocyte subset counts according to COVID-19 severity and SARS-CoV-2 variants conducted in South Korea, and therefore our data could be used as an important reference for another pandemic situation in the future.