abdominal muscle cramping, vomiting, diarrhea, fever.
2007-02-25 20:28:06
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answer #1
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answered by rel541 2
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Salmonella is a genus of rod-shaped Gram-negative enterobacteria that causes typhoid fever, paratyphoid fever and foodborne illness. Salmonella species are motile and produce hydrogen sulfide.
Salmonella is a Gram-negative bacterium. In a clinical laboratory, it is usually isolated on MacConkey agar, XLD agar or DCA agar. Because they cause intestinal infections and are greatly outnumbered by the bacteria normally found in the healthy bowel, primary isolation requires the use of a selective medium, so use of a relatively non-selective medium such as CLED agar is not often practiced. Numbers of salmonella may be so low in clinical samples that stools are routinely also subjected to "enrichment culture" where a small volume of stool is incubated in a selective broth medium, such as selenite broth or Rappaport Vassiliadis soya peptone broth overnight. These media are inhibitory to the growth of the microbes normally found in the healthy human bowel, while allowing salmonellae to become enriched in numbers. Salmonellae may then be recovered by inoculating the enrichment broth on one or more of the primary selective media. On blood agar, they form moist colonies about 2 to 3 mm in diameter. They usually do not ferment lactose.
Salmonella taxonomy is complicated As of 7 December 2005, there are two species within the genus: S. bongori (previously subspecies V) and S. enterica (formerly called S. choleraesuis), which is divided into six subspecies:
I—enterica
II—salamae
IIIa—arizonae
IIIb—diarizonae
IV—houtenae
V—obsolete (now designated S. bongori)
VI—indica
There are also numerous (over 2500) serovars within both species, which are found in a disparate variety of environments and which are associated with many different diseases. The vast majority of human isolates (>99.5%) are subspecies S. enterica. For the sake of simplicity, the CDC recommend that Salmonella species be referred to only by their genus and serovar, e.g.,
Salmonella typhi
instead of the more technically correct designation,
Salmonella enterica subspecies enterica serovar Typhi.
Salmonella isolates are most commonly classified according to serology (Kauffman-White classification).The main division is first by the somatic O antigen, then by flagellar H antigens. H antigens are further divided into phase 1 and phase 2. The full description of a salmonella isolate is given as (O antigens, Vi : H antigen phase 1: H antigen phase 2).
Note that, with the exception of typhoid and paratyphoid, salmonellosis is not a blood-related infection, as is commonly believed.
Examples:
Salmonella Enteritidis (1,9,12:g,m)
(The O antigens present are 1, 9 and 12; the H antigens are g and m)
Salmonella Typhi (9,12,Vi:d:â)
(The O antigens are 9, 12,; the H antigen is d: The Vi antigen is associated with the bacterial capsule, which acts as a Virulence factor, hence its name)
In a clinical laboratory, only a small number of serovars are looked for (the remainder being rare or not clinically significant). The Health Protection Agency recommend testing for the following antigens routinely:
O antigens: 2 4 6.7 8 9 and 3.10
phase 1 H antigens: 1 2 3 4 5 6 7
phase 2 H antigens: a b c d E G i r
Isolates that cannot be identified using this panel are sent to the reference laboratory for identification.
Disease-causing Salmonella species have recently been re-classified into a single species, Salmonella enterica, which has numerous serovars. Salmonella Typhi causes typhoid fever. Other salmonellae are frequent causes of foodborne illness, especially from poultry and raw eggs and more generally from food that has been cooked or frozen, and not eaten straight away. It can also be caught by handling reptiles, such as iguanas or terrapins, which commonly host Salmonella species.
2007-02-25 23:36:02
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answer #2
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answered by Anonymous
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u should have a fever especially raising at evening & decrease at morning, stomach cramp, diarrhea, vomit. widal test for blood confirmation.
2007-02-25 20:39:21
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answer #3
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answered by ary 1
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you usually have diarrhea, nausea and sometimes vomiting, and sometimes fever. but to be sure see your dr, as sometimes it can be the flu.
2007-02-25 20:28:38
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answer #4
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answered by avalon123 4
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