We used ssGSEA analysis to look at the relationship between SELE and CCL20 and 23 different types of immune cells in the COVID-19 and PH datasets, and we found that activated CD4 T cells, activated dendritic cells, natural killer T cells, neutrophils, and plasmacytoid dendritic cells were all linked to COVID-19 and PH. This evidence concerns the gene CCL20 and COVID-19.