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June 21, 1941

Current Comment

JAMA. 1941;116(25):2774. doi:10.1001/jama.1941.02820250040013

ANTI-GRAY HAIR VITAMIN DEFICIENCY IN FOXES  Whether or not the fox is especially susceptible to vitamin deficiency diseases may well be subject to investigation. In any event, one vitamin deficiency in these animals, called Chastek paralysis, has already been referred to in The Journal.1 Perhaps these animals are particularly susceptible to deficiency of thiamine, for now Morgan and Simms2 report observations on 6 young silver foxes, 3 of them placed on a purified diet supplemented by fish liver oil, wheat germ, riboflavin and nicotinic acid, and 3 others receiving the same diet with the addition of a yeast "filtrate factor." Of the first group, 1 died after twenty-six days and the other 2 lost most of their fur. At necropsy the fox that died and the other 2 on deficient diet, pelted four months later, showed large red mottled thymuses. The 3 foxes which received the filtrate factor