Salmonella

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Salmonella

[‚sal·mə′nel·ə]
(microbiology)
A genus of gram-negative, facultatively anaerobic bacteria belonging to the family Enterobacteriaceae that cause enteric infections with or without blood invasion. Most species are motile, utilize citrate, decarboxylate ornithine, form gas from glucose, and produce hydrogen sulfide. Salmonellae do not ferment lactose, produce indole, or split urea; the Voges-Proskauer reaction is negative.

Salmonella

 

a genus of nonsporogenous rod-shaped bacteria that are 1–7 μm long and approximately 0.3–0.7 μm wide. It includes gram-negative facultative aerobes, most of which are motile because they are peritrichous. Salmonella was named in honor of the American pathologist D. E. Salmon (1850–1914).

Salmonellas form round grayish white colonies on solid nutrient mediums and an opacity and sediment and sometimes a film when grown in broth. They ferment carbohydrates, including glucose, mannose, xylose, and dextrin, and alcohols, including inositol and dulcite; an acid and sometimes a gas are formed as well.

Salmonellas generally inhabit the intestine of animals and man. Most belong to pathogenic species that produce various antigens, including the thermolabile flagellate H antigen and the O and V antigens, which consist of carbohydrates. There are more than 20 species in the genus, with more than 1,200 serotypes that differ in antigenic structure and biochemical properties. Among salmonellas are the causative agents of typhoid fever and paratyphoid in humans and salmonelloses in humans and animals.

A. A. IMSHENETSKII

References in periodicals archive ?
Emerging Salmonella Paratyphi A enteric fever and changing trends in antimicrobial resistance pattern of salmonella in Shimla.
Aerobacter aerogenes and Salmonella paratyphi had the highest rate of occurrence while Serratia maracescence and Proteus vulgaris were the least encountered.
cyminum oil Bacteria Essential oil diluted with acetone crude oil 1:10 1:25 1:50 1:75 Bacillus subtilis 27 21 20 17 11 Escherichaia coli 30 19 14 13 9 Klebsiella pneumoniae 30 21 16 12 11 Pseudomonas aeruginosa 24 13 10 10 0 Salmonella mississipi 24 16 15 15 11 Salmonella paratyphi B 26 14 14 14 13 Staphylococcus aureus 21 19 16 14 8 Values are inhibition zone diameter (mm); Acetone alone did not show any activity; Inhibition zones are the mean of three replicates.
Although encephalopathy in the absence of infection of the central nervous system or metabolic derangements is well described in enteric fever, (1-3) it is very rare in infections with nontyphoidal salmonella serotypes and has not been previously described in association with Salmonella paratyphi infection.
Simultaneously, retrospective analysis was done from January 2003-December 2005 to study any difference in the incidence and antimicrobial susceptibility pattern of Salmonella Paratyphi A among enteric fever patients.
Role of molecular typing in an outbreak of Salmonella paratyphi A.
The pathogenicity of strains of Salmonella Paratyphi B and Salmonella Java.
Unusual presentation of enteric fever: three cases of splenic and liver abscesses due to Salmonella typhi and Salmonella paratyphi A.
Ciprofloxacin resistance in Salmonella Paratyphi A.