GASSNER LACTOSE AGAR

Gram-negative bacilli belonging to Enterobacteriaceae are widely dispersed in nature and have been frequently isolated from clinical specimens. The genera in Enterobacteriaceae include pathogens such as Salmonella, Shigella, Yersinia, diarrheogenic E.coli and others. Definitive identification of members of Enterobacteriaceae may require a battery of biochemical tests. Differentiation of the Enterobacteriaceae however is based primarily on the presence or absence of different enzymes coded by the genetic material possessed. These enzymes direct the metabolism of bacteria along one of several pathways that can be detected in vitro. Substrates on which these enzymes can react are incorporated into the culture medium together with an indicator that can detect either utilization of the substrate or the formation of specific metabolic products.

for detection and isolation of pathogenic Enterobacteriaceae from foodstu?s