In pigs as in other mammals, various cells interact with one another to induce an immune response that aims at protecting the organism against any disruption of its integrity, or against microbial pathogens. Two different mechanisms are involved in the immune response. The first one is the innate immune response that is a very fast (active in less than 12 hours) and non-specific response, present since birth and primarily linked to inflammation. This mechanism leads to the activation of phagocytes which in turn secrete active metabolites of oxygen and nitrogen targeting the invading pathogens and many other metabolites or molecules involved in the recruitment and the activation of other cells.

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