KIR3DL1 and viral infectious disease: Haplotypes consisting mostly of inhibitory genes (so called “A” haplotypes) tend to be associated with lower risk of autoimmune diseases, but higher risk of viral infections than haplotypes (“B” haplotypes) containing several activating KIR genes (see Parham, 2005; Khakoo and Carrington, 2006; Kusnierczyk, 2006; Boyton and Altmann, 2007; Campbell and Purdy, 2011).1