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Cryptosporidiosis and isosporiasis in patients with AIDS
1Cornell University, New York, New York.
Abstract:
Cryptosporidium and Isospora belli are coccidian protozoan parasites that were long recognized as pathogens of animals. They were brought to the attention of the medical community by the advent of AIDS. These parasites are associated with persistent, devastating enteritis in patients with AIDS and self-limited diarrheal illness in the immunocompetent host. Cryptosporidiosis appears to be more common than isosporiasis in both patients with AIDS and those who are not immunosuppressed. Clinically, cryptosporidiosis is indistinguishable from isosporiasis. Watery, noninflammatory diarrhea, abdominal cramping pain, and weight loss are the characteristic symptoms. Diagnosis is made by identification of the acid-fast organisms in stained fecal specimens. There is no known effective therapy for cryptosporidiosis, whereas patients with isosporiasis respond promptly to treatment with trimethoprim-sulfamethoxazole. Patients with AIDS and isosporiasis have a high frequency of recurrent infection and therefore should be maintained on suppressive therapy. Much more needs to be learned about these two fascinating and unique parasites to be able to intervene successfully in the management of infected patients with AIDS.
Insights
Cryptosporidium and Isospora belli cause severe diarrhea, especially in AIDS patients. While isosporiasis is treatable with trimethoprim-sulfamethoxazole, cryptosporidiosis lacks effective therapy, highlighting the need for further research.
Area of Science:
- Medical Parasitology
- Infectious Diseases
- Immunology
Background:
- Cryptosporidium and Isospora belli are coccidian protozoan parasites historically known as animal pathogens.
- Their clinical significance in humans gained prominence with the advent of AIDS, causing severe enteritis in immunocompromised individuals.
- Both parasites cause similar gastrointestinal symptoms, including watery diarrhea, abdominal pain, and weight loss.
Purpose of the Study:
- To compare the clinical presentation, diagnosis, and treatment of cryptosporidiosis and isosporiasis.
- To highlight the challenges in managing these infections, particularly in patients with AIDS.
- To underscore the need for further research into these parasitic infections.
Main Methods:
- Diagnosis relies on identifying acid-fast organisms in stained fecal specimens.
- Clinical observations of symptoms and patient outcomes in immunocompetent and immunocompromised hosts.
- Review of therapeutic responses to available treatments.
Main Results:
- Cryptosporidiosis is more prevalent than isosporiasis in both AIDS patients and the general population.
- Clinically, cryptosporidiosis and isosporiasis are indistinguishable.
- Isosporiasis responds to trimethoprim-sulfamethoxazole, while cryptosporidiosis currently lacks effective therapy.
Conclusions:
- Effective therapy for cryptosporidiosis is urgently needed.
- Patients with AIDS and isosporiasis require suppressive therapy due to high recurrence rates.
- Further research is essential for improved management of AIDS patients infected with these protozoan parasites.