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Human cryptosporidiosis
1Department of Community Medicine, Mt. Sinai Medical Center, New York, New York.
Abstract:
Cryptosporidium is an enteric coccidial protozoan recognized in humans in 1976. Since its manifestation as an acquired immunodeficiency syndrome (AIDS)-related infection, new diagnostic techniques have improved recognition of Cryptosporidium oocysts, making apparent its true prevalence in human populations. Cryptosporidium represents 5 to 15% of all enteric pathogens in children in warm climate countries. It is responsible for both endemic and epidemic disease. Day-care center spread is well known, and evidence is strong for person-to-person transmission. The spectrum of illness caused by Cryptosporidium is broad, and while self-limited in immunocompetent individuals, gastrointestinal symptoms can be severe. Asymptomatic infection has been described in population surveys and outbreak investigations. Severe dehydration with malabsorption and failure-to-thrive in children from developing countries has been attributed to this organism. Intractable, incurable diarrhea can be fetal in immunosuppressed adults. Cryptosporidiosis in human immunodeficiency virus-infected individuals is declining in frequency in New York City, possibly reflecting changing sexual behaviors and comparatively low infectivity. No effective treatment for Cryptosporidium has been documented, but clinical trials are in progress.
Insights
Cryptosporidium is a common enteric pathogen causing diarrhea, especially in children. While often self-limiting, it can be severe in immunocompromised individuals, with no effective treatment currently available.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Parasitology
Background:
- Cryptosporidium, an enteric protozoan, was first identified in humans in 1976.
- Its recognition increased significantly with acquired immunodeficiency syndrome (AIDS)-related infections and improved diagnostic methods.
- This parasite is a major cause of enteric illness in children in warm climates, accounting for 5-15% of pathogens.
Purpose of the Study:
- To review the epidemiology, clinical manifestations, and transmission of Cryptosporidium infections in humans.
- To highlight the challenges in diagnosis and the lack of effective treatments.
- To discuss the impact of Cryptosporidium on different patient populations, including immunocompetent individuals, children, and immunosuppressed adults.
Main Methods:
- Literature review of Cryptosporidium epidemiology and clinical studies.
- Analysis of diagnostic advancements and their impact on prevalence data.
- Examination of transmission routes, including person-to-person and daycare settings.
Main Results:
- Cryptosporidium causes both endemic and epidemic enteric diseases, with strong evidence for person-to-person transmission.
- Illness ranges from asymptomatic infection to severe dehydration, malabsorption, and failure-to-thrive in children.
- Severe, intractable diarrhea can be fatal in immunosuppressed adults; however, its frequency in HIV-infected individuals is declining.
Conclusions:
- Cryptosporidium remains a significant public health concern, particularly in vulnerable populations.
- Despite improved diagnostics, effective treatments are still lacking, necessitating ongoing research and clinical trials.
- Understanding transmission dynamics is crucial for controlling outbreaks in community and healthcare settings.