The studies by Donskow-Schmelter et al. (2007), which compared proliferation, apoptosis, and production of IL-2 and IL-6 MLN (mesenteric lymph node) and spleen cells in vitro from fast responder FVB mice and slow responder mice (C57Bl/6) infected with H. polygyrus, demonstrated an important role in the modulation of the host’s response during infection. Here, IL2 is linked to infection.