Evaluation of the Fluo-RAL (RAL) kit for the identification of mycobacteria by fluorescence microscopy. [Évaluation du kit Fluo-RAL (RAL) pour la recherche de mycobactéries en microscopie à fluorescence]
Gerome P.,Laboratory Of Biologie Medicale |
Fabre M.,Laboratory Of Biologie Medicale |
Soler C.,Laboratory Of Biologie Medicale
Pathologie Biologie | Year: 2011
Aim of the study: This study has examined the sensitivity of a commercially available fluorochrome stain, the Fluo-RAL kit (RAL), in comparison to the Degommier's stain as gold standard. Materials and methods: Hundred and thirty-three twin smears, made directly from samples or after their decontamination with N-acetyl-L-cysteine NaOH, were stained, the first slide with the Degommier's method and the second with the Fluo-RAL kit. The samples were 58 sputums, 31 broncho-aspirations, nine gastric lavages, 11 bronchoalveolar lavages, six pleural fluids, two cerebro-spinal fluids, 11 biopsies, two blood cultures and two deep pus. They were examined with 400 × objective under standard fluorescence UV filter by two laboratory technicians independently. The results were expressed with semi-quantitative mean from 0 to 4+. Results: Hundred and thirty-two results were agreed in grading between the two methods: 73 negative smears, nine quantified as rare (1+), 11 as few (2+), 32 as moderate (3+) and seven as numerous (4+). The only discrepant result had concerned a positive smear quantified as 1+ with the Degommier's stain and as 2+ with the Fluo-RAL kit. This discrepancy was confirmed after a second examination. Conclusion: After this study, the Fluo-RAL kit was considered as agreed for its daily use in our laboratory. It improves the standardisation of fluorescence microscopy without additional cost or waste of time and reduces the chemical risk in the laboratory. This test, associated with reading using light-emitting diodes, could allow the development of fluorescence microscopy, the higher sensitive method for direct diagnosis of tuberculosis, in poor-resource countries where tuberculosis is a public health problem. © 2009 Elsevier Masson SAS.
Ghrairi N.,Laboratory Of Biologie Medicale |
Bouakkez H.,Laboratory Of Biologie Medicale |
Nahdi I.,Laboratory Of Biologie Medicale |
Dahmouni A.,Laboratory Of Biologie Medicale |
Yalaoui S.,Laboratory Of Biologie Medicale
Immuno-Analyse et Biologie Specialisee | Year: 2011
Antineutrophil cytoplasmic antibodies (ANCA) are classical serological markers of small-vessels vasculitis. However, they have been described in many others pathological situations. The aim of our study was to determinate clinical usefulness of ANCA in pulmonary institute. Forty-three out of 1070 (4%) patients have positives ANCA by indirect immunofluorescence. Only 24% of patients have small vessels vasculitis. ANCA are targeting the bactericidal-permeability-increasing-protein (BPI) in mainly cases. In our study, ANCA are mainly linked to chronic airway infections such as cystic fibrosis and bronchectases in which they may have long exposure to Gram-negative bacteria. Indirect immunofluorescence (IIF) remains the most widely used technique for ANCA detection. All samples positives by immunofluorescence should have specificity confirmed by Elisa. © 2011 Elsevier Masson SAS.