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Rapid immunodot technique for identifying Bordetella pertussis
G N Sanden1, P K Cassiday, J M Barbaree
1Division of Bacterial and Mycotic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
Journal of Clinical Microbiology
|January 1, 1993
Summary
A new rapid test using monoclonal antibodies can accurately identify Bordetella pertussis cultures. This method offers a specific and efficient alternative to traditional assays for pertussis diagnosis.
Area of Science:
- Immunology
- Microbiology
- Diagnostic Development
Background:
- Accurate identification of Bordetella pertussis is crucial for diagnosing and controlling whooping cough.
- Traditional diagnostic methods can be time-consuming and subjective.
- Development of rapid, specific diagnostic tools is needed.
Purpose of the Study:
- To develop and evaluate a rapid immunoassay for identifying Bordetella pertussis cultures.
- To assess the specificity and sensitivity of monoclonal antibodies against B. pertussis lipooligosaccharide.
Main Methods:
- A rapid test utilizing murine monoclonal antibodies against B. pertussis lipooligosaccharide was developed.
- Bacterial cells were immobilized on nitrocellulose disks and incubated with antibody-peroxidase conjugate.
- Detection involved a peroxidase substrate reaction; results compared with direct fluorescent-antibody assay.
Main Results:
- All 66 confirmed B. pertussis isolates were correctly identified.
- One monoclonal antibody showed high specificity, not reacting with over 20 other bacterial species.
- The assay detected ≥ 2 µg/mL lipooligosaccharide or ≥ 5 x 10^8 B. pertussis cells/mL.
Conclusions:
- The developed rapid test is highly specific and accurate for identifying Bordetella pertussis.
- This method offers advantages over direct fluorescent-antibody assay, including reduced subjectivity and equipment needs.
- The assay is sensitive and utilizes minimal reagents, making it a valuable diagnostic tool.