HLA-A and influenza: Our analysis identified 31 HLA-A alleles in influenza patients (INF-P) and 38 in asymptomatic healthy contacts (INF-C) out of which 7 of the alleles in the INF-P group showed an allele frequency (AF) higher than 6%; the most common were A∗02:01:01 (24.6%), A∗68:01:02 (11.6%), A∗24:02:01 (7.9%), A∗03:01:01 (7.6%), A∗31:01:02 (7.2%), and A∗01:01:01 (6.5%).