RESULTS OF STUDY OF TYPHOID VACCINES IN 4 CONTROLLED FIELD TRIALS IN USSR

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  • 1 January 1965
    • journal article
    • research article
    • Vol. 32  (1) , 1-+
Abstract
In field trials of typhoid vaccine in the USSR, a comparison was made of the effectiveness of chemical, heat-killed, and alcoholized vaccines. Ail of them conferred protection if administered in sufficient dosage, and variations in effectiveness could usually be traced to size of dosage. The heat-killed vaccine, however, appeared to be significantly more effective than the others. The im-munological history of a vaccinated person apparently had no essential influence on the effectiveness of a vaccine, and the data indicated that 2 doses of the vaccine conferred no greater protection than one.

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