A genome-wide association study (GWAS) indicated the complement regulatory protein CD55 as a possible candidate for severe A influenza [9]; indeed, genotype rs2564978*T/T in CD55 showed an OR = 1.75 (P = 0.011) in 177 severe vs. 248 mild Chinese A(H1N1) cases [9]. This evidence concerns the gene CD55 and influenza.