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Salmonella cell dividing. Colored transmission electron micrograph of the bacterium Salmonella typhimurium undergoing division by binary fission. Two daughter cells produced by the division are at top and bottom. At center, the cells are joined by a narrow neck. Through this neck, DNA genetic material is passing in a thin strand (yellow); bacteria do not have a nucleus, and the DNA is scattered in the central region of each developing cell. Once each cell has its full complement of DNA, they separate. Salmonella typhimurium is a common cause of food poisoning (Salmonellosis) in humans, spread in contaminated food. Magnification: X36,000 at 6x4.5cm size.

Image by Dr. Kari Lounatmaa. Image and text copyright 2007 Photo Researchers, Inc. All Rights Reserved. Licensed from Photo Researchers, Inc. for reproduction by Clinical Medicine & Research.

See related article:
Comparison of Salmonella enterica serovar Heidelberg susceptibility testing results pp. 98-105.

In this issue of Clinical Medicine & Research, Nayak et al describe the comparability of results from four different clinical tests of antibiotic susceptibility for the Heidelberg serovar of Salmonella enterica. Antibiotic susceptibility testing is a critical component in determining the most effective course of treatment for infectious diseases.