The paper describes a study, carried out over 16 years, of the use of iodized salt for the control of endemic goitre in a valley of the Himalayan foothills. From 1956, salt was fortified with either potassium iodide or potassium iodate to provide an estimated daily intake of 200 μg per head. There was a progressive and significant decline in goitre prevalence, together with a return of the pattern of iodine metabolism to within normal limits. It is concluded that endemic goitre can be successfully controlled by iodization of domestic salt
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