Abstract
Nutrition as related to resistance and susceptibility to infection presmts two quite opposite notions. In time, the idea that the consumption of adequate and proper food provides the host with greater ability to resist infection, relates to periods of famine accompanied by pestilence, find precedes the more modern concept that deficiencies in certain dietary substances bring about a decrease in the susceptibility and an increased resistance. The latter opinion seems to have arisen from study of the unique and extreme mode of parasitism presented by viruses with the demonstration that tie well-fed and healthy animal rather than the ill-fed and unhealthy animal gave evidence of being less resistant.