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 ?
This should enable genetic engineers to splice into Salmonellae some genes coding for other disease antigens, and place them under the control of these regulatory genes.
For selective enrichment, Lab M's Mueller Kaufmann Tetrathionate Novobiocin Broth (MKTTn) is formulated to inhibit the growth of Proteus species and allow Salmonellae to thrive.
In response to the public health hazard described in this and other reports, CDC and the Public Health Agency of Canada have issued recommendations (Box) to reduce the risk for transmission of salmonellae to humans from contaminated animal-derived pet treats.
Antimicrobial drug use in companion animals, therefore, could increase the likelihood of zoonotic transmission of multidrug-resistant salmonellae by generating drug-resistant strains as well as by making animals more susceptible to resistant infections (12).
reviewed CDC investigations conducted from 1973 to 1983 to determine the rate of hospitalization and death in outbreaks caused by antimicrobial-resistant salmonellae compared with outbreaks caused by pansusceptible salmonellae (10).
Noting the hazards of Salmonella-based rodenticides, many countries have banned their use, and WHO has repeatedly recommended against use of salmonellae in rodenticides.
This case highlights two developments: first, the increasing incidence of reduced susceptibility and resistance of typhoid salmonellae against fluoroquinolones, and second, the inadequacy of the present laboratory guidelines for detecting fluoroquinolone resistance in typhoid salmonellae.
Also, the most important reason for decreasing food animals' carriage of salmonellae is to protect people from becoming ill with Salmonella.
Prevalence of motile salmonellae in egg-laying hens at the end of the laying period.
Approximately 50% of cases of human disease caused by salmonellae are produced by S.
Because cephalosporin resistance in salmonellae has not been reported before in the Caribbean, we investigated the mechanism behind this third-generation cephalosporin resistance further.