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other 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
including mildly virulent, virulent, very virulent, and very virulent+ categories. serotype 2 includes non-oncogenic field viruses. serotype 3 is the turkey herpesvirus, which is nonpathogenic in chickens. however, hvt is immune-stimulating and serves as the foundation of marek's vaccine in short lived, meat...
https://www.bi-vetmedica.com/species/poultry/bird-health-diseases/immune-health.html