Pro-inflammatory cytokines such as interleukin (IL)-2, IL-6, tumor necrosis factor-alpha (TNF-α), and interferon-gamma (IFN-γ) are important for initiating a response to infection, but anti-inflammatory cytokines such as IL-10 are released during any sustained infection to control inflammation and maintain immune homeostasis [4]. This evidence concerns the gene IL2 and infection.