The importance of sunlight for the welfare of the infant and the growing child has only recently been recognized. The favorable effect is ascribed chiefly, if not altogether, to the ultraviolet or invisible rays. As Hess1 recently has pointed out, these radiations constitute less than 1 per cent of the total solar spectrum and it is therefore all the more remarkable that they should prove to be the factor essential to normal growth of the child.
The effect of the ultraviolet rays in rickets in infants and animals has been investigated by many workers in this country and abroad. It has been shown objectively by means of chemical analysis of the blood and the roentgen rays that infantile rickets comes about largely from a lack of the ultraviolet solar rays and can be prevented and cured by such radiations.
Recently, Eidinow 2 reported an increase of the normal bactericidal
BARENBERG LH, FRIEDMAN I, GREEN D. THE EFFECT OF ULTRAVIOLET IRRADIATION ON THE HEALTH OF A GROUP OF INFANTS. JAMA. 1926;87(14):1114–1117. doi:10.1001/jama.1926.02680140032008
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