The recent investigations of the various manifestations of rickets have tended to emphasize the aspects of this disorder that are seen in young infants, so that one is apt to lose sight of the fact that evidences of rickets are often found in older children. Although infantile rickets in the active stage is supposed to have disappeared by the end of the second year even when the child is not treated, there are many exceptions to this rule, particularly among negro and Italian children. In the literature the condition is referred to as instances of "relapsing" rickets. This term is a misnomer, since it implies a previous cure of the condition, whereas in these children the disease has progressed and is evident in a most severe form. For this reason it seems more appropriate to call them cases of "persistent" rickets, since this emphasizes the fact that the disease has
BLOOMBERG MW. THE TREATMENT OF PERSISTENT RICKETS. Am J Dis Child. 1927;34(4):624–633. doi:10.1001/archpedi.1927.04130220102010
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