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Throat Swab, Investigation

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Microbiological control of the pharyngeal swab involves cultivation for the most common causes of microbial pharyngitis.


The most common cause of bacterial pharyngitis is Streptococcus Group A (Lancefield), Streptococcus pyogenes. Up to 20% of Group A carriers of Streptococcus are non-symptomatic children, however, non-symptomatic adult rates are much lower. In these individuals (carriers) isolation of Group A streptococci does not necessarily entail infection.

Extropharyngeal manifestations of Group A streptococcal infection can be divided into those associated with acute infection and post-streptococcal sequelae such as acute rheumatic fever and glomerulonephritis, which appear after 2 to 3 weeks. In acute infection, bacteremia and streptococcal toxic shock can occur. Post-streptococcal sequences appear to be confined to specific germ serotypes.

Group C streptococci (Lancefield) have also been reported as a cause of pharyngitis. The majority of these species, however, rarely cause human diseases. This group includes the species and subspecies Streptoccocus equi zooepidemicus, Streptococcus equi equi and Streptococcus dysgalactiae dysgalactiae. Group C hemolytic Streptococci such as Streptococcus dysgalactiae equisimilis and the group of Streptococcus anginosus (formerly S. milleri group) and which include Streptococcus constellatus pharyngis and Streptococcus anginosus, are very rarely involved.

Group G streptococci known to cause pharyngitis are subdivided into Streptococcus dysgalactiae equisimilis and Streptococcus anginosus.




Important Note

Laboratory test results are the most important parameter for the diagnosis and monitoring of all pathological conditions. 70%-80% of diagnostic decisions are based on laboratory tests. Correct interpretation of laboratory results allows a doctor to distinguish "healthy" from "diseased".

Laboratory test results should not be interpreted from the numerical result of a single analysis. Test results should be interpreted in relation to each individual case and family history, clinical findings and the results of other laboratory tests and information. Your personal physician should explain the importance of your test results.

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