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Spontaneous thyroiditis in the obese strain of chickens. V. The effect of sublethal total body X-irradiation on the development of the disease.


 The effect of neonatal sublethal total body x-irradiation on the development of chronic thyroiditis in chickens of the Obese strain (OS), the Cornell C strain and a “normal” strain of White Leghorns was studied histologically and serologically. At the time of death, 7 weeks after hatching and irradiation, a significant increase in severity and frequency of chronic thyroiditis was observed in both the OS and C strain chickens; thyroiditis was also found in more than half of the irradiated normal White Leghorn chickens. In all three strains under investigation the histologic findings correlated well with the presence of circulating antibodies to thyroglobulin (hemagglutinating and precipitating) in the sera of most of the diseased birds. Irradiation damage to the thyroid glands or to the immune system is discussed from the standpoint of single or combined factors that cause an increase in the severity and frequency of thyroiditis after neonatal x-irradiation of chickens.