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vaccines, growth, and productivity.1-13 the impact of diseases on immune health the avian immune system has many components that help the bird fight infection: lymphoid tissues, the bursa of fabricius, thymus, spleen, and cellular effectors, mainly b and t lymphocytes, as well as other white blood cells
, like macrophages, heterophils, natural killer cells, or dendritic cells. the marek's and ibd viruses attack lymphocytes, subsequently suppressing aspects of the bird's immune functions. the bursa of fabricius is a unique, specialized immune organ in birds that plays an essential role in developing...
https://www.bi-vetmedica.com/species/poultry/bird-health-diseases/immune-health.html