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FEMS Microbiol Lett. 2008 Apr;281(2):198-202. doi: 10.1111/j.1574-6968.2008.01099.x. Epub 2008 Feb 27.

Chlamydia-like bacteria in respiratory samples of community-acquired pneumonia patients.

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Department of Microbial Ecology, University of Vienna, Althanstrasse, Vienna, Austria.


Chlamydia-like bacteria, obligate intracellular relatives of Chlamydia trachomatis and Chlamydophila pneumoniae, are widely distributed in nature. Using a two-step nested and semi-nested PCR approach targeting the 16S rRNA gene, we found DNA of Chlamydia-like bacteria in respiratory samples from patients with community-acquired pneumonia. Of 387 cases tested, four (1.03%) tested positive if only sequences showing less than 99.9% 16S rRNA gene sequence similarity to known Chlamydiae were considered. These included for the first time Protochlamydia amoebophila, Waddlia chondrophila, and 'Candidatus Rhabdochlamydia porcellionis'-related sequences. This study extends previous findings suggesting an association of Chlamydia-like bacteria with respiratory disease, but a causal link between these microorganisms and respiratory tract infections has yet to be established.

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