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How can you differentiate Serratia marcescens and Shigella flexneri as an unknown?
A simple test you can perform is the Citrate test, Serratia marcensens is Citrate positive while Shigella flexneriis citrate negative.
Also Serratia Marcensens is motile and Shigella flexneri is non motile if you have already done a Hydrogen Sulfide test you would have been able to already determine between the two.
Also Serratia marcensens is VP positive while Shigella flexneri is negative.
Serratia marcensens is lipase positive and Shigella flexneri is lipase negative
Another distinguishing characteristic is that Serratia marcensens grows a distinct red color pigmentation the Shigella flexneri does not have.
(These are all according to Bergeys Manual of Systematic bacteriology)
What else can I help you with?
What lab test would differentiate shigella flexneri from yersinia pseudotuberculosis?
To differentiate Shigella flexneri from Yersinia pseudotuberculosis, a key lab test is the urease test. Yersinia pseudotuberculosis is urease positive, while Shigella flexneri is urease negative. Additionally, biochemical tests such as the fermentation of lactose can help, as Shigella flexneri does not ferment lactose, whereas Yersinia may show variable lactose fermentation.
Is shigella indole positive?
Shigella species are generally indole negative, except for Shigella flexneri, which can be indole positive depending on the specific strain. In laboratory identification, indole testing is used to differentiate between various enteric bacteria. Therefore, while most Shigella species do not produce indole, Shigella flexneri may show positive results under certain conditions.
Is shigella flexneri gram positive or negative?
When a gram stain is done on Shigella flexneri, the cells are light pink. This means that they are gram negative.
Is Shigella Positive for a citrate test?
Based on my own test, Shigella flexneri tests negative for the citrate test.
What does shigella flexneri look like on lab test?
Rod Shaped
Which foods can cause the illness Shigellosis?
Shigela flexneri or shigella sonnei
What are some names of bad microbes?
S. aureus, E. coli, P. auriginosa, Salmonella typhi, Shigella sonnei, Shigella flexneri, Vibrio cholera.
What type of pathogen causes shigella?
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.
What is the morphology for shigella flexneril?
Shigella flexneri is a Gram-negative bacterium characterized by its rod-shaped morphology. It typically measures about 0.5 to 0.7 micrometers in diameter and 1 to 3 micrometers in length. These bacteria are non-spore-forming and exhibit a single polar flagellum, although many strains are non-motile. Shigella flexneri is known for its ability to cause dysentery in humans.
WHAT IS BACILLARY DYSENTERY CAUSED BY?
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.
What is shigella spp?
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.
How would you determine whether a colorless colony on MacConkey agar is Salmonella or Shigella?
To differentiate a colorless colony on MacConkey agar, which indicates non-lactose fermenting bacteria, you would perform a series of biochemical tests. First, conduct a hydrogen sulfide (H2S) test; Salmonella typically produces H2S, resulting in black precipitate on triple sugar iron (TSI) agar, while Shigella does not. Additionally, you can perform an indole test; Shigella flexneri is indole positive, while Salmonella is usually negative. Confirmatory tests, such as serotyping or specific PCR assays, can further identify the organism.
