Abstract
Concomitant resistance to tellurium compounds (Ter) and inhibition of coliphage development (Phi) are properties mediated by many H2 incompatibility group R plasmids which were isolated from diverse bacterial and geographic sources. Ter plasmids from Te-resistant bacteria that were isolated from sewage and industrial wastes also mediated phage inhibition. Of these Ter plasmids, three from Citrobacter freundii belonged to the H-incompatibility group but three from Klebsiella pneumoniae did not.