Real time quantitative PCR and RT-PCR for analysis of Pneumocystis carinii hominis

Pneumocystis carinii hominis is a common cause of pneumonia in immunocompromised patients and particularly in those infected by HIV. Giemsa- and Gomori-Grocott-stained smears are widely used for detection and quantification of this opportunistic fungus obtained front biological samples or from in vitro culture. But these methods are fastidious and time-consuming. Thus: instead of performing a count of organisms, we focused our attention on the level of specific DNA by a quantitative PCR technique. This procedure has the advantage of greater precision and more objectivity. To verify the presence of organisms, quantitative RT-PCR based on DHFR and a cell cycle mRNA have been developed. In this current study, we present a detailed description of these methods and their applications for analysis of P. carinii hominis. (C) 2001 Elsevier Science B.V. All rights reserved.