Serotype or serovar are distinct variations within a species of bacteria or viruses or among immune cells of different individuals. These
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The Kauffmann-White classification Scheme is the basis for naming the various serovars of Salmonella. To date, more than 2600 different serotypes have been identified. A Salmonella serotype is determined by the unique combination of reactions of cell surface antigens. The "O" antigen is determined by the outer most portion of the Lipopolysaccharide (LPS) and the "H" antigen is based on the flagellar (protein) antigens. There are two species of Salmonella: Salmonella bongori and Salmonella enterica. Salmonella enterica can be subdivided into six subspecies. The process to identify the serovar of the bacterium consists of finding the formula of cell antigens which represent the variations of the bacteria. First of all, the use of the agglutination method on slides is required in order to get the antigen formula. The agglutination between the antigen and the antibody is made with a specific antisera, which reacts with the antigen to produce a mass. The antigen O is tested with a bacteria suspension from an agar plate whereas the antigen H is tested with a bacteria suspension from a broth culture. The scheme is used to classify the serovar depending on its antigen formula obtained with the reaction of the agglutination.
Serotyping of Salmonella
|HLA Locus||# of Serotypes||Broad Antigens||Split Antigens|
|*DP and many Cw require SSP-PCR for typing.|
Human leukocyte antigens
The immune system is capable of discerning a cell as being 'self' or 'non-self' according to that cell's serotype. In humans, that serotype is largely determined by human leukocyte antigen (HLA), the human version of the major histocompatibility complex. Cells determined to be non-self are usually recognized by the immune system as foreign, causing an immune response, such as hemagglutination. Serotypes differ widely between individuals; therefore, if cells from one human (or animal) are introduced into another random human, those cells are often determined to be non-self because they do not match the self-serotype. For this reason, transplants between genetically non-identical humans often induce a problematic immune response in the recipient, leading to transplant rejection. In some situations this effect can be reduced by serotyping both recipient and potential donors to determine the closest HLA match.
Role in organ transplantation
Role in organ transplantation 1
- Human leukocyte antigens 1.1
- Serotyping of Salmonella 2
- See also 3
- References 4
- External links 5
Serotypes were discovered by the American microbiologist Rebecca Lancefield in 1933.
Serotyping often plays an essential role in determining species and subspecies. The Salmonella genus of bacteria, for example, has been determined to have over 2600 serotypes, including Salmonella enterica serovar Typhimurium, S. enterica serovar Typhi, and S. enterica serovar Dublin. Vibrio cholerae, the species of bacteria that causes cholera, has over 200 serotypes, based on cell antigens. Only two of them have been observed to produce the potent enterotoxin that results in cholera: 0:1 and 0:139.
. serocomplex or sometimes serogroup A group of serovars with common antigens is called a