Abstract
Hedgecock, Loyd W. (Veterans Administration Hospital, St. Louis, Mo.). Dietary influence on innate and acquired resistance to tuberculosis. J. Bacteriol. 92:439–445. 1966.—The pattern of deaths of CF1 mice maintained both on a defined ration and on commercial chow, and infected with the H37Rv strain of Mycobacterium tuberculosis was compared with that of animals infected with four wild strains of tubercle bacilli as well as with the Vallée and Ravenel strains of M. bovis. All infected animals fed the defined ration died at a slower rate than those fed chow. The dietary effects were most evident in the groups of mice infected with the human strains of M. tuberculosis at reduced dose levels. Under these conditions, a decrease in rate of death occurred in the infected mice fed the defined ration at approximately 3 weeks after infection. Deaths in the animals infected with the bovine strains and fed the defined ration were distributed normally. Interval counts of the number of tubercle bacilli in the lungs of mice infected with a reduced dose of the H37Rv strain of M. tuberculosis showed that in vivo growth of the organisms was inhibited at 2 weeks in the animals fed the defined ration and at 3 weeks in those fed chow. Nonviable vaccines prepared from the H37Rv human strain and from the Ravenel and Vallée strains of M. bovis were ineffective against infection with the bovine strains. All vaccines were effective against infection with the H37Rv strain of M. tuberculosis.
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Selected References
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