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α4β7+ and α4β7- ALS IgG and IgA Responses. Individual S. flexneri 2a LPS-specific α4β7+ and α4β7- ALS IgG and IgA ELISA endpoint titres with group geometric mean and 95% confidence intervals either 7 days post-first immunization or 7 days post-challenge (day 63) grouped by treatment and consensus shigellosis outcome. (a) α4β7+ ALS IgG; (b) α4β7+ ALS IgA; (c) α4β7- ALS IgG; (d) α4β7- ALS IgA.
