In the laboratory, the screening procedure used to differentiate Salmonella and Shigella from other Enterobacteriaceae includes testing for their inability to:
Inability to ferment lactose is used to differentiate Salmonella and Shigella from other Enterobacteriaceae. Option 1, 3, 4 Enterobacteriaceae propeies: Ferments glucose Reduces nitrate to nitrite Oxidase test negative Catalase positive (except Shigella dysenteriae type-1) Motile, except Shigella and Klebsiella. Option 2 Lactose fermenters Non Lactose fermenters Escherichia Klebsiella Enterobacter Other members of Enterobacteriaceae family including Salmonella and Shigella.
Ferment glucose
Ferment lactose
Produce cytochrome oxidase
Reduce nitrates
Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli)