[Show abstract][Hide abstract] ABSTRACT: Microsporidia are currently considered emerging pathogens responsible for life-threatening infections in organ transplant recipients. Here, we describe the first cases of intestinal microsporidiosis by Enterocytozoon bieneusi genotype D in two non-HIV-infected renal transplant recipients from Spain. Previously reported cases of microsporidiosis in organ transplant recipients have also been reviewed, highlighting the necessity of considering organ transplant recipients a risk group for microsporidiosis. A systematic search for these parasites is recommended in cases of persistent diarrhea and in the differential diagnosis of other syndromes, such as chronic fever of unknown etiology.
Journal of clinical microbiology 02/2011; 49(4):1301-6. · 4.23 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A total of 105 single fresh stool samples were collected from diarrhoeal patients with (80 HIV-positive and 25 HIV-negative) from the Army and the Police hospitals, Addis Ababa. The stool samples were processed by water-ether sedimentation method; they were stained with Uvitex-2B technique for microscopic detection of intestinal microsporidium. A portion of all samples were preserved in 200microl PBS containing 2% PVPP ((Polyvinylpolypyrolidone) for confirmation with PCR. 18/105(17.2%) of the cases were positive for intestinal microsporidial infection by at least one method. 8/105 (7.6%) positive both by microscopy and PCR and 10/105 (9.5%) were positive only by PCR. All microsporidia positive cases were also HIV positive. Based on PCR analysis, 15 Enterocytozoon bieneusi and 3 Encephalitozoon intestinalis were identified. This study has shown that intestinal microsporidiosis is a common cause of chronic diarrhoea in advanced AIDS patients and this is mainly attributed to Enterocytozoon bieneusi. To the best of our knowledge, this is the first report of intestinal microsporidiosis in Ethiopia. It has an important implication for the understanding of the aetiology of diarrhoea in HIV/AIDS patients in the country.
[Show abstract][Hide abstract] ABSTRACT: Nosema ceranae, a microsporidian parasite originally described from Apis cerana, has been found to infect Apis melllifera and is highly pathogenic to its new host. In the present study, data on the ultrastructure of N. ceranae, presence of N. ceranae-specific nucleic acid in host tissues, and phylogenetic relationships with other microsporidia species are described. The ultrastructural features indicate that N. ceranae possesses all of the characteristics of the genus Nosema. Spores of N. ceranae measured approximately 4.4 × 2.2 μm on fresh smears. The number of coils of the polar filament inside spores was 18–21. Polymerase chain reaction (PCR) signals specific for N. ceranae were detected not only in the primary infection site, the midgut, but also in the tissues of hypopharyngeal glands, salivary glands, Malpighian tubules, and fat body. The detection rate and intensity of PCR signals in the fat body were relatively low compared with other examined tissues. Maximum parsimony analysis of the small subunit rRNA gene sequences showed that N. ceranae appeared to be more closely related to the wasp parasite, Nosema vespula, than to N. apis, a parasite infecting the same host.
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