Lymphoid nodules in the thymus of the chicken.

It is generally accepted that the thymus is one of the central lymphoid organs in the chicken and that lymphoid nodules are rarely seen in the thymus. Jankovió and his collaborators (1967, 1969) reported the presence of lymphoid nodules in the thymus of some chickens. We have made similar observation while studying the ontogeny of lymphoid organs in the chicken. This paper deals with the appearance of lymphoid nodules in the thymuses of normal chickens and chickens vaccinated with Newcastle disease.

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