Moreover, Amstutz and colleagues have found that 45% of patients with PJP received long-term corticosteroids before and during COVID-19, and discovered a median absolute lymphocyte count (IQR) of 610 (280–920) cells/mm3 (n = 23) and a CD4 count (IQR) of 66 (33–291.5) cells/mm3 (n = 20) in the studied population [11]. This evidence concerns the gene CD4 and COVID-19.