Abstract
Ribi, E. (Rocky Mountain Laboratory, Hamilton, Mont.), R. L. Anacker, W. Brehmer, G. Goode, C. L. Larson, R. H. List, K. C. Milner, and W. C. Wicht. Factors influencing protection against experimental tuberculosis in mice by heat-stable cell wall vaccines. J. Bacteriol. 92:869–879. 1966.—Studies of nonviable, heat-stable vaccines for active protection against experimental tuberculosis have been continued with a test involving aerosol challenge of intravenously vaccinated mice. The previously reported activating effect of light mineral oil on disrupted cells of the BCG strain was found to be shared by certain other mineral oils and a synthetic, 24-carbon hydrocarbon, but not by kerosene or any of several vegetable oils. Dry cell walls coated with a small amount of oil and dispersed in saline with aid of an emulsifier were suitable for intravenous administration and were effective in promoting resistance to challenge. Oil used in this manner, in contrast to water-in-oil emulsions of the Freund type which could not be administered intravenously, did not potentiate the tuberculin-sensitizing activity of the cell walls. Although the amount of oil required for full effect was small (< 0.5 ml/100 mg of dry antigen), there was a critical level below which optimal enhancement was not achieved. More stable suspensions than could be obtained with the other oils were readily prepared from cell walls treated with the synthetic hydrocarbon, 7-n-hexyloctadecane. Extended experience has shown that in this test system both the viable BCG standard vaccine and heated, oil-treated experimental vaccines gave highly reproducible results showing graded responses to graded doses.
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Selected References
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