Among the common protective variants, we list as example three variants which confer protection to Human Immunodeficiency Virus (HIV), the first two, and leprosy, the third one: a CCR2 variant (rs1799864) identified in 8 patients, a CCR5 (rs1800940) in one patient and a TLR1 variant (rs5743618) in 26 patients (not shown). Here, CCR5 is linked to leprosy.