Efficacy of a low-cost, inactivated whole-cell oral cholera vaccine: results from 3 years of follow-up of a randomized, controlled trial.

Variations in vaccine protection for each age group, by year of follow-up, did not reach statistical significance (two-tailed P values for comparison of PE in years 1,2, and 3 of follow-up in the 1–4 year, 5–14 year, and ≥15 year age groups were .11, .87, and .98, respectively).

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