It was confirmed that cytokines such as IL-12, TNF-α, IFN-γ, and IL-2 play an important role in controlling the proliferation of Babesia in the early and acute stages of infection, while IL-10, IL-4, IL-5, and IL-6 may involve in chronic and low parasitemia stages of infections (41–45). The gene discussed is IL4; the disease is infection.