<style face="normal" font="default" size="100%">Acquired immunity to heavy infection with Mycobacterium bovis bacillus Calmette-Guérin and its relationship to the development of nonspecific unresponsiveness in vitro.</style>

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0<style face="normal" font="default" size="100%">Acquired immunity to heavy infection with Mycobacterium bovis bacillus Calmette-Guérin and its relationship to the development of nonspecific unresponsiveness in vitro.</style><style face="normal" font="default" size="100%">Acquired immunity to heavy infection with Mycobacterium bovis bacillus Calmette-Guérin and its relationship to the development of nonspecific unresponsiveness in vitro.</style>