| Summary: | <i>Kosakonia cowanii</i> (syn. <i>Enterobacter cowanii</i>) is a highly competitive bacterium that lives with plant, insect, fish, bird, and human organisms. It is pathogenic on some plants and an opportunistic pathogen of human. Nine novel viruses that lyse plant pathogenic strains and/or human strains of <i>K. cowanii</i> were isolated, sequenced, and characterized. Kc166A is a novel kayfunavirus, Kc261 is a novel bonnellvirus, and Kc318 is a new cronosvirus (all <i>Autographiviridae</i>). Kc237 is a new sortsnevirus, but Kc166B and Kc283 are members of new genera within <i>Podoviridae</i>. Kc304 is a new winklervirus, and Kc263 and Kc305 are new myoviruses. The viruses differ in host specificity, plaque phenotype, and lysis kinetics. Some of them should be suitable also as pathogen control agents.
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