It might be likely that patients’ viral load with HLA-C*04:01 might be increased throughout the initial stage of infection [108], but patients start to develop symptoms after 7 days [109,110,111]; this period may have been skipped to determine the relationship with SARS-CoV-2 viral loads and HLA-C*04:01 when recorded at the beginning of infection. Here, HLA-C is linked to infection.