RESULTS OF THE STUDY OF TYPHOID VACCINES IN FOUR CONTROLLED FIELD TRIALS IN THE USSR.
In field trials of typhoid vaccine in the USSR, a comparison was made of the effectiveness of chemical, heat-killed, and alcoholized vaccines. All 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 immunological history of a vaccinated person apparently had no essential influence on the effectiveness of a vaccine, and the data indicated that two doses of the vaccine conferred no greater protection than one.
D000293:Adolescent; D006801:Humans; D012106:Research; D013223:Statistics as Topic; D014436:Typhoid-Paratyphoid Vaccines; D014586:USSR; D014611:Vaccination
D014436:Typhoid-Paratyphoid Vaccines
ADOLESCENCE; STATISTICS; TYPHOID-PARATYPHOID VACCINES; USSR; VACCINATION