Cytometric Approach for Detection of Encephalitozoon intestinalis, an Emergent Agent

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Barbosa, J (Autor) Outra; rodrigues, ag (Autor) FMUP; pina-vaz, c (Autor) FMUP

Revista

Título: Clinical and Vaccine Immunology

Vol. 16

Páginas: 1021-1024

ISSN: 1556-6811

Editora: American Society for Microbiology

Indexação

ISI Web of Knowledge - 9 Citações

Scopus - 8 Citações

Outras Informações

ID Authenticus: P-003-HP0

DOI: 10.1128/cvi.00031-09

Abstract (EN): Encephalitozoon intestinalis is responsible for intestinal disease in patients with AIDS and immunocompetent patients. The infectious form is a small spore that is resistant to water treatment procedures. Its detection is very important, but detection is very cumbersome and time-consuming. Our main objective was to develop and optimize a specific flow cytometric (FC) protocol for the detection of E. intestinalis in hospital tap water and human feces. To determine the optimal specific antibody (Microspor-FA) concentration, a known concentration of E. intestinalis spores (Waterborne, Inc.) was suspended in hospital tap water and stool specimens with different concentrations of Microspor-FA, and the tap water and stool specimens were incubated under different conditions. The sensitivity limit and specificity were also evaluated. To study spore infectivity, double staining with propidium iodide (PI) and Microspor-FA was undertaken. Distinct approaches for filtration and centrifugation of the stool specimens were used. E. intestinalis spores stained with 10 mu g/ml of Microspor-FA at 25 degrees C overnight provided the best results. The detection limit was 5 x 10(4) spores/ml, and good specificity was demonstrated. Simultaneous staining with Microspor-FA and PI ensured that the E. intestinalis spores were dead and therefore noninfectious. With the stool specimens, better spore recovery was observed with a saturated solution of NaCl and centrifugation at 1,500 x g for 15 min. A new approach for the detection of E. intestinalis from tap water or human feces that ensures that the spores are not viable is now available and represents an important step for the prevention of this threat to public health.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4