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Shigela flexneri or shigella sonnei
To differentiate between Salmonella enteritidis and Shigella sonnei, the triple sugar iron (TSI) agar test can be used. Salmonella enteritidis typically produces hydrogen sulfide (H2S), resulting in black colonies on TSI agar, while Shigella sonnei does not produce H2S and will not change the color of the agar. Additionally, biochemical tests such as urease and indole tests can further help distinguish between the two, as Shigella sonnei is urease negative and indole positive, while Salmonella enteritidis is urease negative and indole negative.
S. aureus, E. coli, P. auriginosa, Salmonella typhi, Shigella sonnei, Shigella flexneri, Vibrio cholera.
Shigella is caused by a type of bacterium. Specifically, it is a genus of bacteria belonging to the family Enterobacteriaceae. Shigella is known to cause shigellosis, an infectious disease characterized by diarrhea, fever, and abdominal cramps. There are four main species of Shigella, with Shigella dysenteriae, Shigella flexneri, Shigella boydii, and Shigella sonnei being the most common.
Shigella sonnei is primarily known for its inability to ferment many carbohydrates. However, it can ferment certain sugars, such as glucose and, to a lesser extent, lactose. It typically does not ferment sucrose or other disaccharides. The fermentation of glucose is often used as a key characteristic for identifying this bacterium in laboratory settings.
Bacillary dysentery, also known as shigellosis, is caused by infection with Shigella bacteria. There are four main species of Shigella that can lead to this illness: Shigella dysenteriae, Shigella flexneri, Shigella boydii, and Shigella sonnei. The bacteria are primarily transmitted through contaminated food and water, as well as direct person-to-person contact. Symptoms typically include diarrhea, fever, and abdominal cramps.
Shigella spp. are a group of bacteria that cause shigellosis, an infectious disease characterized by diarrhea, abdominal pain, and fever. These bacteria are highly contagious and are primarily transmitted through contaminated food and water, as well as person-to-person contact. Shigella infections can lead to severe gastrointestinal symptoms and may require medical treatment, especially in vulnerable populations. The four main species of Shigella are Shigella dysenteriae, Shigella flexneri, Shigella boydii, and Shigella sonnei.
S. dysenteriae generally produces the most severe attacks, and S. sonnei the mildest attacks of shigellosis.
Its currently an obsolete term. Previously used to denote the late lactose fermentors like Shigella sonnei, citrobacter etc.
i did tests on shigella dysenteriae the tube was purple top yellow bottome for the decarboxylase and purple top and bottom with a yellow mid for the LIA control meaning that the organism can utilise lysine as the tube has gone purple at the bottom
S.sonnei is not a true lactose fermenting bacteria (see.. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=271578&blobtype=pdf)But is a delayed lactose fermenter as it does not have the enzyme permease to transport lactose through its cell wall.However an ONPG lactose fermenting test does not require permease to allow the bacterium to ferment lactose so in an ONPG test the shigella sonnei will appear as lactose fermenting positive.Hope this helps!!2nd year BMS student
Mnemonic: KEE Klebsiella pneumoniae Enterobacter cloacae E. coli Shigella sonnei can ferment lactose, but only after prolonged incubation and so it is referred to as a '''''late-lactose fermenter'''''. Vibrio cholerae is also a late lactose fermenter.