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Association of stool bifidobacteria in early infancy, at 6 to 15 weeks of age, with vaccine responses at 2 years of age. Top row, TT-specific CD4 T-cell SI (top row); middle row, TT-specific plasma IgG; bottom row, stool polio type 2–specific IgA. The asterisk (*) indicates a single, off-scale value (>7.5).
