FCGR3A and infection: The current study demonstrated that the FcγRIIA-131Arg/ FcγRIIIA-176F/FcγRIIIBNA2 haplotype was associated with an increased susceptibility to SMA, while the FcγRIIA-131Arg/ FcγRIIIA-176F/ FcγRIIIBNA1 haplotype was associated with increased levels of circulating parasites during infection.