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The tuberculosis vaccine BCG ΔureC::hly is the most advanced BCG replacement candidate in phase II clinical development. Here we assess the protective capacity of the construct administered to mice as homologous prime-boost vaccine prior Mycobacterium tuberculosis infection and as post-exposure vaccine. Multiple immunization did not improve the superior protection of BCG ΔureC::hly over BCG. Animals with subclinical tuberculosis were better protected when vaccinated with BCG ΔureC::hly as compared to BCG. Our findings suggest further consideration of BCG ΔureC::hly as post-exposure vaccine.
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