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Shedding of fecal GSA65 antigen. Gerbils received either La1 (▪) or placebo (○) daily from 7 days before inoculation with the trophozoites of G. intestinalis WB clone C6 (5 × 105 trophozoites per animal). Values represent the ratio between GSA65-positive (GSA65 +) gerbils and the total number of gerbils at various times after Giardia infection. The number of animals per group was 18, 12, and 5 at 7, 14, and 21 days post-Giardia infection, respectively.
