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Serotyping and Cross-Reactivity's Between Different Pseudomonas aeruginosa Isolates Prevalent in Iran
H Ahmadi1, S Maleknia, B Tabaraie
1Department of Bacterial Vaccines and Antigen Production, Pasteur Institute of Iran, Tehran, Iran.
Background And Objectives:
300 Pseudomonas aeruginosa strains were isolated from hospitalized patients in Iran. Using international antigenic typing system (IATS) antibodies, all strains were classified into 16 serotypes while serotype 14 was not identified among the 17 known serotypes. To evaluate the rate of cross-reactivity between O- antigenic determinants, monospecific polyclonal antibodies were made against whole-killed-cells and live cells of each serotype.
Materials And Methods:
Each antiserum was challenged against homologous and heterologous antigens using slide agglutination test. The degree of agglutination reaction is shown by -ve, 1+ve, 2+ve, 3+ve and 4+ve for 0, 25%, 50%, 75% and 100% agglutination respectively. Then, the results were tabulated for further study.
Results:
The rate of cross-reactivity between O-antigenic determinants demonstrated that strains 10.55 and 15.14 had the highest agglutination reaction with serum of all the homologous and heterologous serotypes.
Conclusion:
Evaluation of the results obtained from the present study can be applied in production of reliable vaccines and antisera as therapeutic agents or as diagnostic kits.
Insights
This study analyzed 300 Pseudomonas aeruginosa strains from Iran, finding significant cross-reactivity between O-antigenic determinants. These findings are crucial for developing reliable diagnostic kits and therapeutic agents.
Area of Science:
- Medical Microbiology
- Immunology
- Bacteriology
Background:
- 300 Pseudomonas aeruginosa strains were isolated from hospitalized patients in Iran.
- The International Antigenic Typing System (IATS) classified strains into 16 serotypes, with serotype 14 being absent.
- Monospecific polyclonal antibodies were generated to assess O-antigenic determinant cross-reactivity.
Purpose of the Study:
- To evaluate the cross-reactivity rate between O-antigenic determinants of Pseudomonas aeruginosa serotypes.
- To understand antigenic relationships for improved diagnostics and therapeutics.
Main Methods:
- Slide agglutination tests were performed using homologous and heterologous antigens against specific antisera.
- Agglutination reactions were quantified from 0% to 100% (-ve to 4+ve).
- Results were tabulated to analyze cross-reactivity patterns.
Main Results:
- Significant cross-reactivity was observed between O-antigenic determinants.
- Strains 10.55 and 15.14 exhibited the highest agglutination reactions across various homologous and heterologous serotype sera.
- This indicates complex antigenic relationships among the studied Pseudomonas aeruginosa strains.
Conclusions:
- The observed cross-reactivity has implications for the production of reliable vaccines and antisera.
- Findings can inform the development of effective diagnostic kits for Pseudomonas aeruginosa infections.
- Understanding antigenic determinants is key for advancing therapeutic strategies.
