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Serological response of rhesus monkeys to histoplasma, Blastomyces, and Coccidioides antigens
Abstract:
Fifteen adult rhesus monkeys were inoculated with nonviable Histoplasma capsulatum, Blastomyces dermatitidis, or Coccidioides immitis. Antibody assays were made periodically during a 2-year period by use of a complement-fixation (CF) test employing four antigens and a latex-agglutination test. Selected sera were also studied in an immunodiffusion test and a coccidioidin-precipitin test. The serological patterns obtained with the anti-Histoplasma, anti-Blastomyces, and anti-Coccidioides monkey sera were comparable to those of sera from patients with diseases caused by the respective organisms. Rhesus monkeys should provide a good laboratory model for additional studies, including the influence of multiple antigenic stimuli on serologic response and patterns. Monkeys could also be used for the production of antisera required for studies to improve the specificity of the currently available CF antigens.
Insights
Rhesus monkeys inoculated with fungal antigens developed antibody responses comparable to humans. This study suggests monkeys are a valuable model for studying fungal infections and developing diagnostic tests.
Area of Science:
- Mycology
- Immunology
- Veterinary Medicine
Background:
- Fungal infections like histoplasmosis, blastomycosis, and coccidioidomycosis pose significant public health challenges.
- Accurate serological diagnostic tests are crucial for timely and effective treatment of these mycoses.
Purpose of the Study:
- To evaluate the utility of rhesus monkeys as a model for studying serological responses to fungal pathogens.
- To compare the immune response in monkeys to that observed in humans infected with Histoplasma capsulatum, Blastomyces dermatitidis, and Coccidioides immitis.
Main Methods:
- Fifteen adult rhesus monkeys were inoculated with nonviable Histoplasma capsulatum, Blastomyces dermatitidis, or Coccidioides immitis.
- Antibody levels were monitored over two years using complement-fixation (CF), latex-agglutination, immunodiffusion, and coccidioidin-precipitin tests.
Main Results:
- The serological patterns in monkeys closely mirrored those seen in human patients with corresponding fungal diseases.
- Consistent antibody production was observed in response to the inoculated fungal antigens.
Conclusions:
- Rhesus monkeys serve as a suitable animal model for investigating fungal serology and immune responses.
- This model can aid in understanding the impact of multiple antigenic stimuli and in producing specific antisera for improved diagnostic test development.