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Evolution of footpad size (A) and survival curves (B) after M. ulcerans injection for unvaccinated B6 mice and B6 mice vaccinated with BCG once or twice 6 or 16 weeks prior to infection. ▪, no BCG; ▴, BCG at week 16; ○, BCG at week 6; *, BCG at weeks 6 and 16.
