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Journal of Clinical Microbiology, March 1999, p. 575-580, Vol. 37, No. 3
Avian and Swine Respiratory Diseases Research
Unit, USDA Agricultural Research Service, National Animal Disease
Center, Ames, Iowa 50010
Received 6 October 1998/Accepted 8 December 1998
Few identification methods will rapidly or specifically detect all
bacteria in the order Chlamydiales, family
Chlamydiaceae. In this study, three PCR tests based on
sequence data from over 48 chlamydial strains were developed for
identification of these bacteria. Two tests exclusively recognized the
Chlamydiaceae: a multiplex test targeting the
ompA gene and the rRNA intergenic spacer and a TaqMan test
targeting the 23S ribosomal DNA. The multiplex test was able to detect
as few as 200 inclusion-forming units (IFU), while the TaqMan test
could detect 2 IFU. The amplicons produced in these tests ranged from
132 to 320 bp in length. The third test, targeting the 23S rRNA gene,
produced a 600-bp amplicon from strains belonging to several families
in the order Chlamydiales. Direct sequence analysis of this
amplicon has facilitated the identification of new chlamydial strains.
These three tests permit ready identification of chlamydiae for
diagnostic and epidemiologic study. The specificity of these tests
indicates that they might also be used to identify chlamydiae without
culture or isolation.
0095-1137/99/$00.00+0
Rapid Detection of the Chlamydiaceae and
Other Families in the Order Chlamydiales: Three PCR
Tests
*
Corresponding author. Present address: Department of
Medical Microbiology/Parasitology, College of Veterinary Medicine,
University of Georgia, Athens, GA 30602-7371. Phone: (706) 542-5823. Fax: (706) 542-5771. E-mail: keverett{at}calc.vet.uga.edu or
kdeeverett{at}hotmail.com.
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