It has been reported that ACE2 is the receptor of SARS‐COV‐2 and plays a crucial role in the infection,25 lymphocytes which express the ACE2 may be a direct target of viruses that vulnerable to be attacked,26 and SARS‐CoV‐2‐induced NKG2A expression may be correlated with functional exhaustion of cytotoxic lymphocytes at the early stage, which may result in disease progression.27 This evidence concerns the gene ACE2 and infection.