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Describe the appearance of the strict pathogens

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1) Describe the appearance of the strict pathogens, Salmonella and Shigella, in triple sugar iron. How can these pathogens be differentiated biochemically from other members of Enterobacteriaceae? How do their colonies present on MacConkey, Hektoen Enteric (HE), and Salmonella Shigella (SS) agars?

2) How are O, H, K, and VI antigens used to serotype Enterobacteriaceae? What is the significance of the heat-labile quality of the K antigen? How can the presence of the K antigen confer virulence? What is the significance of the Vi antigen?

3) Option 3: Research how drinking water is tested for the presence of enteric gram-negative rods. What organisms are considered indicators of fecal contamination? What levels of organisms present are considered acceptable?

Reference no: EM132555795

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