Antagonistic action of Streptococcus salivarius and Streptococcus faecalis to Mycobacterium tuberculosis

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Abstract
S. salivarius and S. faecalis inhibited the growth of M. tuberculosis on Lowenstein-Jensen and Middlebrook 7H11 agars, but not on the latter medium when antibacterial drugs were added. S. faecalis was more inhibitory than S. salivarius to 15 strains of M. tuberculosis. S. salivarius produced little or no inhibition of growth of Runyon group III organisms but was very antagonistic to Runyon group I mycobacteria. [These findings have relevance for the clinical isolation and diagnosis of M. tuberculosis and for the use of bacterial antagonism as a possible typing scheme for mycobacterial isolates.].