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Microsporidiosis as an AIDS-related opportunistic infection
1National Center for Infectious Diseases, Centers for Disease Control and Prevention, Albuquerque, New Mexico, USA.
Abstract:
The clinical manifestations of AIDS-related microsporidiosis range from mild or asymptomatic infections to debilitating illness involving the gastrointestinal, respiratory, or urogenital tracts or the eyes. Intestinobiliary infections with Enterocytozoon bieneusi are the most common microsporidial diseases, but disseminated infections with Encephalitozoon hellem, Encephalitozoon cuniculi, and Septata intestinalis are being increasingly recognized. The isolation of infective microsporidial spores from urine and respiratory secretions and the presence of spores in stool and duodenal aspirates suggest that person-to-person transmission may occur. Primary infection may also occur by inhalation or ingestion of spores from environmental sources or by zoonotic transmission. Development of guidelines for prevention of microsporidiosis will require that sources of infection and modes of transmission be more clearly elucidated. The presence of infective spores in bodily fluids, however, suggests that precautions when handling body fluids in clinical settings and personal hygiene measures such as hand washing may help to prevent primary infections.
Insights
AIDS-related microsporidiosis presents varied symptoms. Understanding transmission routes is crucial for preventing infections, with hygiene measures offering initial protection.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Immunocompromised Host Research
Background:
- Microsporidiosis is an opportunistic infection common in individuals with Acquired Immunodeficiency Syndrome (AIDS).
- Clinical presentations range from asymptomatic to severe, multi-systemic disease affecting the gastrointestinal, respiratory, urogenital tracts, and eyes.
- Enterocytozoon bieneusi causes the most frequent intestino-biliary infections, while Encephalitozoon species (E. hellem, E. cuniculi) and Septata intestinalis are increasingly implicated in disseminated disease.
Purpose of the Study:
- To review the clinical spectrum of AIDS-related microsporidiosis.
- To discuss the known and potential transmission routes of microsporidia in immunocompromised patients.
- To highlight the need for further research into infection sources and transmission dynamics for effective prevention strategies.
Main Methods:
- Review of clinical case reports and epidemiological studies on microsporidiosis in AIDS patients.
- Analysis of published data on the identification of microsporidia in various clinical specimens (stool, duodenal aspirates, urine, respiratory secretions).
- Synthesis of information regarding environmental and zoonotic sources of microsporidial spores.
Main Results:
- AIDS-related microsporidiosis exhibits a wide clinical range, from mild to life-threatening conditions.
- Enterocytozoon bieneusi is the predominant pathogen, but disseminated infections by Encephalitozoon spp. and Septata intestinalis are rising.
- Spores detected in urine, respiratory secretions, stool, and duodenal aspirates suggest multiple transmission pathways, including potential person-to-person, environmental, and zoonotic routes.
Conclusions:
- Effective prevention of microsporidiosis in AIDS patients necessitates a comprehensive understanding of infection sources and transmission modes.
- The presence of spores in bodily fluids indicates the importance of universal precautions in healthcare settings and personal hygiene, such as hand washing, to mitigate transmission risks.