Color enhanced Transmission Electron Micrograph (TEM) of a Salmonella phage isolated from the Inner Harbor in Baltimore, Maryland. A bacteriophage, also known informally as a phage, is a virus that infects and replicates within a bacterium. In the recent years, the use of bacteriophages has been suggested as a possible tool to combat this zoonotic pathogen in poultry farms. Numerous bacteriophages specific to Salmonella have been isolated or identified as part of host genome sequencing projects. Salmonella is a genus of rod-shaped (bacillus) gram-negative bacteria of the Enterobacteriaceae family. The two species of Salmonella are Salmonella enterica and Salmonella bongori. Salmonella enterica is the type species and is further divided into six subspecies that include over 2,500 serotypes. Magnification: unknown..