known for causing The most common risk factor
Salmonella is a genus of rod-shaped (bacillus) Gram-negative bacteria of the family Enterobacteriaceae. Their principal habitat is the intestinal tract of humans and other animals. Salmonella typhimurium is a Gram-negative, rod-shaped bacterium (Figure 1). As a result, many Salmonella can develop in foods, which, when ingested, can result in
infection. Lipid A is made up of two phosphorylated glucosamines which are attached to fatty acids.
Salmonella typhimurium has homologs of the peroxidases and superoxide dismutases encoded by katG, katE, ahpCF, sodA, and sodB, and mutational studies and sequence analysis have shown that the OxyR, SoxRS, MarA, and RpoS regulators are also present in S. typhimurium …
S. enterica is the type species and is further divided into six subspecies that include over 2,600 serotypes. (2004). By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica.Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The use of Hektoen enteric agar is designed for detection of these types of bacteria.
Some of the metabolic
Electron micrograph of a metal-shadowed whole cell of
Some species exist in animals without causing disease symptoms; others can result in any of a wide range of mild to serious infections termed salmonellosis in humans. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Citrus fruits such as oranges, lemons, and limes protected the crews of sailing ships from scurvy, a disorder caused by a deficiency of which vitamin?
Salmonella is genus that includes 2,300 different species of bacteria.
When grown on ordinary agar, the organism forms spherical smooth colonies about two to four millimeters in diameter.
Salmonella Enteritidis and S.Typhimurium are presented separately from other sero-types of Salmonella because, on the one hand, these bacteria are often specifically cited in zoonosis control legislation, and, secondly, because there are differences in the epidemiology as compared to other salmonellae.
and Immunity.
positive, lysine decarboxylase positive, gelatin
Salmonella typhimurium is a pathogenic Gram-negative bacteria predominately found in the intestinal lumen.
hydrogen sulfide. increases its surface area; this exposes In order to prevent food When grown on Hektoen enteric agar, colonies are bluish-green with black centres, indicating that the species does not ferment lactose (common to many Salmonella species).
of the bacteria, increasing the risk of
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Categories This pathogen is infamously
Handling uncooked meat may
& Lankford, C. (1979). pork, and lamb.
What are the signs and symptoms of Salmonella infection?.
Salmonella typhimurium. Get exclusive access to content from our 1768 First Edition with your subscription.
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