A brucella phage of the Izatnagar series, designated Iz1, was lytic for all Brucella species that are normally smooth, although the efficiency of plating varied between biovars and species. The phage was also lytic for rough strains of B melitensis and B suis and, to a lesser extent, B ovis. It displayed negligible lytic activity towards B canis and rough B abortus cultures. In its morphological and serological properties and its stability to inactivating agents, the Iz1 phage resembled other brucella phages.
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