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Most gut bacteria, including Salmonella, can ferment the sugar xylose to produce acid; Shigella colonies cannot do this and therefore remain red. After exhausting the xylose supply Salmonella colonies will decarboxylate lysine, increasing the pH once again to alkaline and mimicking the red Shigella colonies.
Hektoen enteric agar (HEK, HE or HEA) is a selective and differential agar [1] primarily used to recover Salmonella and Shigella from patient specimens. HEA contains indicators of lactose fermentation and hydrogen sulfide production; as well as inhibitors to prevent the growth of Gram-positive bacteria.
Shigella is a leading cause of bacterial diarrhea worldwide, with 80–165 million annual cases (estimated) [6] and 74,000 to 600,000 deaths. [ 6 ] [ 7 ] It is one of the top four pathogens that cause moderate-to-severe diarrhea in African and South Asian children.
Salmonella species can be found in the digestive tracts of humans and animals, especially reptiles. Salmonella on the skin of reptiles or amphibians can be passed to people who handle the animals. [39] Food and water can also be contaminated with the bacteria if they come in contact with the feces of infected people or animals. [40]
TSI agar slant results: (from left) preinoculated (as control), P. aeruginosa, E. coli, Salmonella Typhimurium, Shigella flexneri The Triple Sugar Iron (TSI) test is a microbiological test roughly named for its ability to test a microorganism's ability to ferment sugars and to produce hydrogen sulfide. [1]
A drug-resistant strain of Shigella bacteria is quickly becoming more common, the CDC warns. Here's what to know about shigellosis transmission, symptoms and treatment.
Infections from the drug-resistant Shigella bacteria, ... More people could die from once-treatable infections, such as bacterial pneumonia, gonorrhea or salmonella. Those who need antibiotics ...
Two years ago, the U.S. Centers for Disease Control began tracking a sharp rise in cases of extensively drug-resistant (XDR) shigellosis — infections by particular strains of Shigella bacteria ...