The essential role of LLO was documented by the isolation of nonhemolytic transposon mutants which were completely avirulent; i.e., the 50% lethal dose increased approximately 5 logs (6, 16, 23, 48)
The essential role of LLO was documented bythe isolation of nonhemolytic transposon mutants whichwere completely avirulent; i.e., the 50% lethal dose increasedapproximately 5 logs (6, 16, 23, 48)