PCR-hybridization assay for Mycobacterium avium complex: optimization of detection in peripheral blood from humans |
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| Authors: | Ferrario G Gori A Rossi A Catozzi L Molteni C Marchetti G Bandera A Rossi M C Esposti A D Franzetti F |
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| Affiliation: | Institute of Infectious Diseases and Tropical Medicine, Luigi Sacco Hospital, University of Milan, Milan, Varese, Italy. |
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| Abstract: | ![]()
We evaluated the sensitivity of a DNA amplification test for the detection of Mycobacterium avium in blood samples using different blood components and different DNA extraction methods. M. avium-inoculated blood samples were processed to obtain separate blood components: peripheral blood mononuclear cells (PBMCs), polymorphonuclear cells (PMNCs), and whole-blood sodium dodecyl sulfate (SDS)-lysate pellets. The sensitivity for the detection of the lowest mycobacterial load (1 CFU/ml) was significantly greater (P < 0.01) with DNA extracted from SDS-lysate pellets than with DNA extracted from PBMCs or PMNCs. Subsequently, DNA extraction methods based on guanidine NaOH, and proteinase were compared. The sensitivity of the guanidine-based method was significantly greater (P < 0.01) than those of the others. |
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