Abstract
Members of the genus Thermus were examined for the presence of bacteriocinlike inhibitory activity. Testing was done by the deferred antagonism technique. Antagonistic activity, as evidenced by zones of inhibition, was expressed by Thermus rubens against all other Thermus strains tested. T. rubens itself was immune to this activity. Plasmid analysis of T. rubens revealed the presence of one plasmid of approximately 64 megadaltons.