Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Anti-S. flexneri 2a strain 2457T serum bactericidal endpoint titers (with geometric means) of vaccinated subjects over time: day 0 (baseline), day 28 (post-first vaccination), and day 56 (post-second vaccination). §, statistically significant difference from baseline samples; *, statistically significant difference from placebo at the same time point.
