Increased Susceptibility of Mice to Swine Influenza as a Result of Methionine Injections.

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Abstract
The expts. showed that a low protein diet increased the resistance of mice to infection with swine influenza virus. Addition of 15 mg. of methionine to this diet, however, resulted in a great increase in the susceptibility of the mice to infection with swine influenza virus. This increased susceptibility did not occur when the methionine was added to a diet with adequate protein content.