Related Experiment Video
Updated: Aug 19, 2026

Sequencing of Bacterial Microflora in Peripheral Blood: our Experience with HIV-infected Patients
Published on: June 11, 2011
[Disseminated microspiridiosis (Encephalitozoon intestinalis) in a patient with HIV infection]
U Lippert1, J Schottelius, C Manegold
1Klinische Abteilung (Chefarzt Prof. Dr. G. Burchard).
History And Clinical Findings:
A 39-year-old patient with advanced HIV infection was admitted to our hospital with a 6-month history of diarrhoea, abdominal pain and pansinusitis.
Investigations:
Ultrasound and endoscopic retrograde cholangiography revealed cholangitis of the larger bile ducts. Stool examinations and coloscopy were unremarkable. No pathogenic organisms were identified by routine investigations. Finally, microsporidia of the genus encephalitozoon were diagnosed by electron microscopy in biopsies from the bile duct and the nasal mucous membrane and in stool samples by polymerase chain reaction (PCR).
Treatment And Course:
Albendazole treatment was successful. The cholestatic liver tests and the ultrasound findings normalized. Control tests of stool, bile and nasal secretions by light microscopy, electron microscopy, and PCR were negative.
Conclusion:
Microsporidia, along with human cytomegalovirus, cryptosporida and mycobacteria other than tuberculosis are increasingly recognized as causing opportunistic infections in immunodeficient patients, especially in AIDS-related cholangitis. Some species can cause systemic infection. Therefore microsporidia infection should be considered in the differential diagnosis of all patients with immunodeficiency.
Insights
Microsporidia, a type of opportunistic infection, can cause serious illness in patients with advanced HIV. Early diagnosis and treatment with albendazole are effective in managing microsporidial infections.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Immunology
Background:
- Opportunistic infections are common in patients with advanced HIV.
- AIDS-related cholangitis presents diagnostic challenges.
- Microsporidia are emerging pathogens in immunocompromised individuals.
Observation:
- A 39-year-old patient with advanced HIV presented with chronic diarrhea, abdominal pain, and pansinusitis.
- Initial investigations including ultrasound and cholangiography revealed cholangitis, but routine stool and coloscopy were unremarkable.
- Microsporidia (Encephalitozoon) were definitively diagnosed via electron microscopy and PCR in bile duct, nasal, and stool samples.
Findings:
- Albendazole treatment led to successful resolution of cholangitis and normalization of liver tests.
- Post-treatment samples were negative for microsporidia by multiple diagnostic methods.
- This case highlights the systemic potential of microsporidial infections.
Implications:
- Microsporidia should be considered in the differential diagnosis of immunocompromised patients with unexplained symptoms, particularly cholangitis.
- Accurate diagnosis requires specialized techniques like electron microscopy and PCR.
- Prompt treatment with albendazole can effectively manage microsporidial infections in AIDS patients.
Related Concept Videos
Fungal Phylum Microsporidia
Cryptococcal Meningitis
Toxoplasmosis
Giardiasis
Amebiasis
Encephalitis ll: Pathophysiology

