Eosinophils are a subset of granulocytes that normally reside in the circulation. When activated, these cells secrete toxic compounds that are a key component in the eradication of helminthic parasite infections. Eosinophils are recruited to sites of parasite infections by: A) Interferon-$\gamma$ produced by T_H1 cells B) CCL11 produced by T_H2 cells C) Interferon-$\gamma$ produced by CD8 cytotoxic T cells D) CCL20 produced by T_H17 cells E) GM-CSF produced by T_H1, T_H2, and T_H17 cells

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Eosinophils are recruited to sites of parasite infections by CCL11 (also known as eotaxin), which is produced by T_H2 cells. Interferon-F1F1F1S1γF1F1F10 (IFN-γ) produced by CD8 cytotoxic T cells and GM-CSF produced by various immune cells can also activate eosinophils, but they do not directly recruit them to sites of infection. CCL20 is a chemokine that primarily recruits other immune cells, such as dendritic cells and T cells, and is not involved in eosinophil recruitment to parasite infections.

Eosinophils Are a Subset of Granulocytes That Normally Reside in the Circulation