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Direct detection of Histoplasma capsulatum in soil suspensions by two-stage PCR.

Authors
Reid-TM; Schafer-MP
Source
Mol Cell Probes 1999 Aug; 13(1):269-273
NIOSHTIC No.
20027693
Abstract
Histoplasmosis is the most common pulmonary mycosis in the United States. The responsible fungal pathogen, Histoplasma capsulatum , grows in soils contaminated with bird or bat droppings. Inhalation of dust from contaminated areas containing H. capsulatum spores is a primary route of infection. The ability to detect H. capsulatum in soil samples has been limited by the lack of fast, reliable and inexpensive methods. A polymerase chain reaction (PCR) method was developed that allows the direct detection of H. capsulatum in soil. A two-stage PCR protocol was followed employing both fungal-specific primers and nested primers specific for the internal transcribed spacer (ITS) region of the 58S rRNA gene of H. capsulatum . The estimated limit of detection of this method is 10 spores. In contrast to the more expensive and indirect mouse inoculum assay, which requires 6-8 weeks for sample analysis, PCR analysis of soil contaminated with H. capsulatum can be completed in less than 2 days.
Keywords
Pulmonary-system-disorders; Pulmonary-system; Pulmonary-disorders; Respiratory-irritants; Respiratory-system-disorders; Fungal-diseases; Fungal-infections; Fungi; Pathogens; Soil-sampling; Dust-inhalation; Dust-analysis; Dust-exposure; Dust-sampling; Dust-particles; Analytical-methods; Laboratory-animals; Ribonucleic-acids
Contact
Divisions of Biomedical and Behavioral Sciences, National Institute/Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, Ohio 45226
Publication Date
19990801
Document Type
Journal Article
Email Address
tar9@cdc.gov
Fiscal Year
1999
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0890-8508
NIOSH Division
DBBS
Source Name
Molecular and Cellular Probes
State
OH
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