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Salmonella is a gram negative rods genus belonging to the Enterobacteriaceae family. Within 2 species, Salmonella bongori and Salmonella enterica, over 2500 different serotypes or serovars have been identified to date.
Salmonella is a gram negative rods genus belonging to the Enterobacteriaceae family. Within 2 species, Salmonella bongori and Salmonella enterica, over 2500 different serotypes or serovars have been identified to date.
See less1. Body fluid or tissue culture: For the culture, a small sample of your blood, stool, urine, or bone marrow is placed on a special medium that encourages the growth of bacteria. The culture is checked under a microscope for the presence of typhoid bacteria. A bone marrow culture often is the most sRead more
1. Body fluid or tissue culture:
For the culture, a small sample of your blood, stool, urine, or bone marrow is placed on a special medium that encourages the growth of bacteria. The culture is checked under a microscope for the presence of typhoid bacteria. A bone marrow culture often is the most sensitive test for Salmonella typhi.
Although performing a culture test is the most common diagnostic test, another testing may be used to confirm a suspected typhoid fever infection, such as a test to detect antibodies to typhoid bacteria in your blood, or a test that checks for typhoid DNA in your blood.
See lessEnteric fever, also known as typhoid fever, is caused by the bacteria Salmonella Typhi (S Typhi) and Salmonella Paratyphi A and B. The pathogenesis of enteric fever depends on a number of factors including the infecting species and infectious dose. Ingested organisms survive exposure to gastric acidRead more
Enteric fever, also known as typhoid fever, is caused by the bacteria Salmonella Typhi (S Typhi) and Salmonella Paratyphi A and B. The pathogenesis of enteric fever depends on a number of factors including the infecting species and infectious dose. Ingested organisms survive exposure to gastric acid before gaining access to the small bowel, where they penetrate the epithelium, enter the lymphoid tissue, and disseminate via the lymphatic or hematogenous route.
See lessThe most important diagnostic characteristic is the ability of the E. coli strain to produce the Shiga toxin Stx2. Therefore, the stools should be assayed with a sensitive and specific test that detects the toxin gene stx2 or the isolation of the pathogen with the detection of Stx2 production or theRead more
The most important diagnostic characteristic is the ability of the E. coli strain to produce the Shiga toxin Stx2. Therefore, the stools should be assayed with a sensitive and specific test that detects the toxin gene stx2 or the isolation of the pathogen with the detection of Stx2 production or the gene encoding it. The detection of Stx using ELISA directly from stool has a low specificity.
See lessEscherichia coli (E. coli) is a bacteria that is commonly found in the lower intestine of warm-blooded organisms. Most E.coli strains are harmless, but some can cause serious food poisoning. Shiga toxin-producing E. coli (STEC) is a bacterium that can cause severe foodborne disease.
Escherichia coli (E. coli) is a bacteria that is commonly found in the lower intestine of warm-blooded organisms. Most E.coli strains are harmless, but some can cause serious food poisoning. Shiga toxin-producing E. coli (STEC) is a bacterium that can cause severe foodborne disease.
See lessSome of the common characteristics of Enterobacteria are: 1. Gram-negative. 2. Rod-shaped (usually short bacilli; about 1 – 5 μm). 3. Facultatively anaerobic. 4. Non-sporing. 5. Mostly motile with peritrichous flagella, ( most species in the genera Klebsiella and Shigella are non-motile). 6. CatalasRead more
Some of the common characteristics of Enterobacteria are:
1. Gram-negative.
2. Rod-shaped (usually short bacilli; about 1 – 5 μm).
3. Facultatively anaerobic.
4. Non-sporing.
5. Mostly motile with peritrichous flagella, ( most species in the genera Klebsiella and Shigella are non-motile).
6. Catalase positive, oxidase negative.
7. Both lactose fermenters and non-fermenter.
8. Usually, acid-producing.
9. Usually, nitrate-reducing.
10. Characteristic antigens are known as enterobacterial common antigens (ECA). The outer membrane (O), flagella (H), and capsule (K) are antigens in most enterobacteria.
Members of the family Enterobacteriaceae have the following characteristics: They are gram-negative rods, either motile with peritrichous flagella or nonmotile. They grow on peptone or meat extract media without the addition of sodium chloride or other supplements. They grow well on MacConkey agar.Read more
Members of the family Enterobacteriaceae have the following characteristics: They are gram-negative rods, either motile with peritrichous flagella or nonmotile. They grow on peptone or meat extract media without the addition of sodium chloride or other supplements. They grow well on MacConkey agar. They grow aerobically and anaerobically (are facultative anaerobes). They ferment rather than oxidize glucose, often with gas production. They are catalase positive, oxidase negative (except for Plesiomonas), and reduce nitrate to nitrite. They have a 39–59% G + C DNA content.
See lessEnterobacteriaceae are a family of gram-negative bacteria. They are rod-shaped and can be either motile with peritrichous flagella or nonmotile.
Enterobacteriaceae are a family of gram-negative bacteria. They are rod-shaped and can be either motile with peritrichous flagella or nonmotile.
See lessEnterobacteriaceae is a large family of Gram-negative bacteria that includes over 30 genera and more than 100 species. The classification of Enterobacteriaceae above the level of family is still a subject of debate, but one classification places it in the order Enterobacterales of the class GammaproRead more
Enterobacteriaceae is a large family of Gram-negative bacteria that includes over 30 genera and more than 100 species. The classification of Enterobacteriaceae above the level of family is still a subject of debate, but one classification places it in the order Enterobacterales of the class Gammaproteobacteria in the phylum Pseudomonadota. Some of the most notable genera of Enterobacteriaceae include Escherichia, Salmonella, Klebsiella, Enterobacter, and Citrobacter.
It’s important to note that while Enterobacteriaceae is a large family of bacteria, not all members of the family are pathogenic. Some members of the family are harmless symbionts, while others are found in water or soil, or are parasites on a variety of different animals and plants.
See less
fungus, plural fungi, any of about 144,000 known species of organisms of the kingdom Fungi, which includes the yeasts, rusts, smuts, mildews, molds, and mushrooms. Fungi are among the most widely distributed organisms on Earth and are of great environmental and medical importance. Many fungi are freRead more
fungus, plural fungi, any of about 144,000 known species of organisms of the kingdom Fungi, which includes the yeasts, rusts, smuts, mildews, molds, and mushrooms. Fungi are among the most widely distributed organisms on Earth and are of great environmental and medical importance. Many fungi are free-living in soil or water; others form parasitic or symbiotic relationships with plants or animals.
See lessFungi are eukaryotic organisms; i.e., their cells contain membrane-bound organelles and clearly defined nuclei. Historically, fungi were included in the plant kingdom; however, because fungi lack chlorophyll and are distinguished by unique structural and physiological features (i.e., components of the cell wall and cell membrane), they have been separated from plants. In addition, fungi are clearly distinguished from all other living organisms, including animals, by their principal modes of vegetative growth and nutrient intake. Fungi grow from the tips of filaments (hyphae) that make up the bodies of the organisms (mycelia), and they digest organic matter externally before absorbing it into their mycelia.
While mushrooms and toadstools (poisonous mushrooms) are by no means the most numerous or economically significant fungi, they are the most easily recognized. The Latin word for mushroom, fungus (plural fungi), has come to stand for the whole group. Similarly, the study of fungi is known as mycology—a broad application of the Greek word for mushroom, mykēs. Fungi other than mushrooms are sometimes collectively called molds, although this term is better restricted to fungi of the sort represented by bread mold. (For information about slime molds, which exhibit features of both the animal and the fungal worlds,