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Demographics of the participants included in this study.
| Characteristics | Unvaccinated | Ty21a vaccinated |
|---|---|---|
| Number of volunteers | 18 | 12 |
| Age, mean (range) | 56 (47–73) | 58 (50–73) |
| Sex, # female (%) | 14 (78 %) | 8 (67%) |
| Ethnicity, # of Caucasian (%) | 9 (50 %) | 9 (75%) |
| # of African American (%) | 8 (44 %) | 2 (17 %) |
| # of Asian (%) | 1 (6 %) | 1(8 %) |
