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*Helminth infections require both T<sub>H</sub>1 and T<sub>H</sub>2 responses, e.g. during ''S. mansoni'' the secretion of IFNγ by T<sub>H</sub>1 cells activates mechanisms that destroy larvae in the lungs, although the T<sub>H</sub>2 subset, secreting IL-5, predominate. IL-5 is responsible for the eosinophilia associated with parasite infections.
 
*Helminth infections require both T<sub>H</sub>1 and T<sub>H</sub>2 responses, e.g. during ''S. mansoni'' the secretion of IFNγ by T<sub>H</sub>1 cells activates mechanisms that destroy larvae in the lungs, although the T<sub>H</sub>2 subset, secreting IL-5, predominate. IL-5 is responsible for the eosinophilia associated with parasite infections.
 
*T<sub>H</sub>2 cells are required for the destruction of intestinal worms, where they induce mucosal mast cells and interact with [[Eosinophils|eosinophils]]
 
*T<sub>H</sub>2 cells are required for the destruction of intestinal worms, where they induce mucosal mast cells and interact with [[Eosinophils|eosinophils]]
While cell-mediated immunity is important in tissue infections, such as Leishmania, specific antibodies are important in controlling parasites that live in the bloodstream, e.g. malaria. Mechanisms of antibody-mediated immunity include:
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*Directly damaging protozoa
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*Activating [[Complement|complement]], and the subsequent Membrane Attack Complex
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*Blocking attachment to host cells
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*Enhancing macrophage phagocytosis
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*Involvement in antibody-dependent cell-mediated cytotoxicity
      
==Humoral==
 
==Humoral==
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