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In a strictly controlled field trial among schoolchildren a study was made of the protective capacity of single doses of 2 typhoid vaccines: a heat-killed broth-grown sorbed dried vaccine made in the USSR (vaccine G-66) and an acetone-killed agar-grown dried vaccine (vaccine K-66) made in Yugoslavia. The latter vaccine was supplied by the World Health(More)
In 1968-70 a field trial was arranged in the USSR to evaluate the effectiveness of dried sorbed paratyphoid B and typhoid vaccines when administered in two doses separated by an interval of 20-30 days.TWO GROUPS OF SCHOOLCHILDREN WERE UNDER OBSERVATION: a group inoculated with paratyphoid B vaccine (75 805 children) and a group inoculated with typhoid(More)
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