HLA-B and COVID-19: COVID‐19 outbreak between northern and southern Italy has shown unexplained discrepancy, so they have set up a study to investigate the hypothesize for the effect of regional prevalence of HLA class I alleles which may underlie to make different immune response,40 and only HLA‐B*44,C*01 were correlated with COVID‐19 spreading in the northern region of Italy.