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Infection and Immunity, May 2000, p. 2744-2747, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Detection of Chlamydia pneumoniae DNA and Antigen in
the Circulating Mononuclear Cell Fractions of Humans and
Koalas
Tracey J.
Bodetti and
Peter
Timms*
Centre for Molecular Biotechnology and
Co-Operative Research Centre for Diagnostic Technologies, School of
Life Sciences, Queensland University of Technology, Brisbane, Australia
Received 20 December 1999/Returned for modification 21 January
2000/Accepted 16 February 2000
Chlamydia pneumoniae is a common respiratory pathogen
of humans which, in addition to causing disease at the respiratory
site, has recently been linked to disease at other body sites. If
C. pneumoniae does contribute to disease at nonrespiratory
sites, then it must have a mechanism by which it reaches these sites. We analyzed the peripheral blood mononuclear cell (PBMC) fractions from
60 healthy human blood donors for the presence of C. pneumoniae DNA (by ompA PCR) and chlamydial antigens
(by genus- and species-specific monoclonal antibody staining). Ten of
the sixty (16.7%) blood donors were C. pneumoniae positive
by PCR, and all 10 of these PCR-positive individuals' samples
demonstrated specific staining with anti-C. pneumoniae
monoclonal antibodies. The only other host naturally infected with
C. pneumoniae is the koala, in which the bacterium also
causes respiratory infections. We demonstrated the presence of C. pneumoniae DNA and antigens in the PBMC fractions of 30% of 20 koalas tested. Our finding of C. pneumoniae-infected PBMCs
in koalas as well as humans suggests that the ability to infect PBMCs
and to disseminate from the respiratory site is not restricted to the
human biovar of C. pneumoniae but is a general characteristic of this chlamydial species.
*
Corresponding author. Mailing address: School of Life
Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Australia 4001. Phone: 61 7 38642120. Fax: 61 7 38641534. E-mail: p.timms{at}qut.edu.au.
Infection and Immunity, May 2000, p. 2744-2747, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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