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Updated: Aug 13, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Applications of fluorescent antibody for detecting capsular substances in Staphylococcus epidermidis
Abstract:
A fluorescent antibody technique was developed for the determination of the type of capsule of strains of Staphylococcus epidermidis. Many mouse virulent and avirulent strain populations were investigated. Of 300 fresh isolates of Staph. epidermidis, 27 were mouse virulent strains and of these 74.1% and 25.9% were mono- and polyvalent, respectively. The frequency of capsular type antigens I, II and III, produced by the 27 virulent strains was found to be 18.5%, 88.9% and 18.5%, the majority being capsular type II. In the mouse avirulent strains, capsular type antigen production was demonstrated in 263 out of 273 strains examined and mono- and polyvalent capsular types comprised 52.3% and 44.0%, respectively. Capsular type I, II, III strains and non-typable strains occurred at frequencies of 15.0%, 95.2%, 34.9% and 3.7% respectively, the majority of mouse avirulent strains also being capsular type II. These results indicate that a majority of ordinary Staph. epidermidis produced capsular type antigens although the capability is quantitatively different according to strain.
Insights
A new fluorescent antibody technique identified Staphylococcus epidermidis capsule types. Most strains produce capsular antigens, with type II being most common in both virulent and avirulent populations.
Area of Science:
- Microbiology
- Immunology
- Bacteriology
Background:
- Staphylococcus epidermidis is a common bacterium.
- Capsular polysaccharides play a role in bacterial virulence.
- Understanding capsular types is crucial for Staph. epidermidis research.
Purpose of the Study:
- To develop a fluorescent antibody technique for determining Staphylococcus epidermidis capsule types.
- To investigate the prevalence of different capsular types in mouse virulent and avirulent strains.
Main Methods:
- Development of a fluorescent antibody technique.
- Analysis of 300 fresh isolates of Staphylococcus epidermidis.
- Categorization of strains into mouse virulent and avirulent groups.
- Determination of capsular antigen types (I, II, III) using the developed technique.
Main Results:
- A fluorescent antibody technique was successfully developed for Staphylococcus epidermidis capsule typing.
- Among 27 mouse virulent strains, 74.1% were monovalent and 25.9% were polyvalent.
- Capsular type II was the most frequent antigen in both virulent (88.9%) and avirulent (95.2%) strains.
- Capsular antigen production was observed in a majority of both virulent and avirulent strains, though quantitatively different.
Conclusions:
- The developed fluorescent antibody technique is effective for Staphylococcus epidermidis capsule typing.
- Most Staphylococcus epidermidis strains produce capsular antigens.
- Capsular type II is predominant in both virulent and avirulent strains, suggesting its importance in Staph. epidermidis populations.
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