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  • Title: Controlled field trials of killed oral typhoid and paratyphoid B vaccines and cell-free, chemical aerosol typhoid vaccine.
    Author: Hejfec LB, Levina LA, Salmin LB, Antonova AA, Segal LS, Kuzminova ML, Slavina KM, Vasileva AV.
    Journal: Dev Biol Stand; 1976; 33():93-7. PubMed ID: 821803.
    Abstract:
    Three controlled field trials were carried out. One of them (1963) showed that an aerosol with cell-free, chemical typhoid vaccine did not protect vaccinees from the disease. The other trials (1964 and 1965) assessing the efficacy of killed oral typhoid vaccine revealed a short term (up to 3 months) protective effect. In the trial of oral paratyphoid B vaccine no statistically significant difference in morbidity in the test and control groups was observed due to the small number of cases.
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