Although the GSTM1−/− and GSTT1−/− genotypes were more frequent among patients with severe COVID-19, this difference did not reach statistical significance (p > 0.05), indicating no clear association with disease severity. However, the GSTT1−/− genotype was significantly linked to increased mortality risk, with a hazard ratio of 2.28 (p = 0.047), and the combined genotype GSTM1+/+ with GSTT1−/− showed an even higher risk of death (HR = 2.72, p = 0.02) (Abbas et al., 2021)(India, 269, 269, N/A). Here, GSTM1 is linked to COVID-19.