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Identification of Legionella pneumophila antigens and antibodies by immunoferritin electron microscopy
Abstract:
Material from 18 lungs positive for Legionella pneumophila and 21 strains of legionella grown on bacteriological media or in the yolk sac of fertile hen's eggs were examined by direct negative stain and immunoferritin electronmicroscopy. The 18 lung samples and all preparations of cultivated organisms showed the presence of bacteria with the typical morphology of L. pneumophila. By immunoferritin electronmicroscopy, with specific antisera, it was possible to serogroup the organisms. The immunoferritin method in reverse made it possible to detect and titrate antibody in sera from patients. Direct and immunoferritin electronmicroscopy were as sensitive as immunofluorescent antibody tests for detecting the antigens and antibodies of Legionnaires' disease. Additional advantages of the ultrastructural technique are discussed.
Insights
Electron microscopy, including immunoferritin techniques, effectively identified Legionella pneumophila bacteria in lung samples and cultures. This ultrastructural method also detected antibodies in patient sera, proving as sensitive as other diagnostic tests for Legionnaires
Area of Science:
- Microbiology
- Immunology
- Electron Microscopy
Background:
- Legionella pneumophila is a bacterium that causes Legionnaires' disease, a severe form of pneumonia.
- Accurate and sensitive diagnostic methods are crucial for identifying L. pneumophila infections.
Purpose of the Study:
- To evaluate the utility of direct negative stain and immunoferritin electron microscopy for detecting Legionella pneumophila.
- To assess the ability of immunoferritin electron microscopy to serogroup L. pneumophila and detect patient antibodies.
Main Methods:
- Examination of 18 infected lung samples and 21 cultured L. pneumophila strains using direct negative stain electron microscopy.
- Application of immunoferritin electron microscopy with specific antisera for organism identification and antibody detection.
- Comparison of electron microscopy sensitivity with immunofluorescent antibody tests.
Main Results:
- Bacteria with the characteristic morphology of L. pneumophila were identified in all lung samples and cultured preparations.
- Immunoferritin electron microscopy successfully serogrouped the L. pneumophila strains.
- The immunoferritin method enabled detection and titration of antibodies in patient sera.
- Electron microscopy demonstrated sensitivity comparable to immunofluorescent antibody tests for antigen and antibody detection.
Conclusions:
- Direct and immunoferritin electron microscopy are effective tools for diagnosing Legionnaires' disease.
- Immunoferritin electron microscopy offers advantages for bacterial identification, serogrouping, and antibody detection in Legionnaires' disease.
- Ultrastructural techniques provide a sensitive and valuable approach to Legionella diagnostics.