CXCR4 has been implicated in different types of cancer [18]–[20], in the WHIM (Warts, Hypogammaglobulinemia, Infection and Myelokathexis) syndrome [21], [22], in rheumatoid arthritis [23], and in the immune response during fungal asthma [24]. This evidence concerns the gene CXCR4 and infection.