Six Patas monkeys were fed a protein-free diet while 16 animals of the same species receoved a standard monkey diet. The protein-depleted monkeys showed reduced absorption of folic acid but not Dxylose, and 5 out of 6 exhibited depressed exocrine pancreatic function. When challenged with Vibrio cholerae, animals with reduced folic acid absorption and pancreatic enzyme production excreted the micro-organisms for a longer time.
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