In a study by Wang et al. [21], it was found that TRBV10 and TRBV2 had significantly lower expression in COVID-19 patients, while TRBV12, TRBV20, TRBV24, TRBV3, and TRBV9 showed higher expression in COVID-19 patients compared to healthy controls, whether in the baseline, acute, or convalescent group. Here, TRBV9 is linked to COVID-19.