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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 7 or 25 weeks prior to infection. ▪, no BCG; ▴, BCG at week 25; ○, BCG at week 7; *, BCG at weeks 7 and 25.
