Abstract:
:Mycobacterium avium subsp. paratuberculosis is the causative agent of Johne's disease (JD) in cattle and may be associated with Crohn's disease (CD) in humans. It is the slowest growing of the cultivable mycobacteria, and culture from clinical, veterinary, food, or environmental specimens can take 4 months or even longer. Currently, the insertion element IS900 is used to detect M. avium subsp. paratuberculosis DNA. However, closely related IS900 elements are also present in other mycobacteria, thus limiting its specificity as a target. Here we describe the use of novel primer sets derived from the sequences of two highly specific single copy genes, MAP2765c and MAP0865, for the quantitative detection of M. avium subsp. paratuberculosis within 6 h by using real-time PCR. Specificity of the target was established using 40 M. avium subsp. paratuberculosis isolates, 67 different bacterial species, and two intestinal parasites. Using the probes and methods described, we detected 27 (2.09%) M. avium subsp. paratuberculosis-positive stool specimens from 1,293 individual stool samples by the use of either IS900 or probes deriving from the MAP2765c and MAP0865 genes described here. In general, bacterial load due to M. avium subsp. paratuberculosis was uniformly low in these samples and we estimated 500 to 5,000 M. avium subsp. paratuberculosis bacteria per gram of stool in assay-positive samples. Thus, the methods described here are useful for rapid and specific detection of M. avium subsp. paratuberculosis in clinical samples.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Imirzalioglu C,Dahmen H,Hain T,Billion A,Kuenne C,Chakraborty T,Domann Edoi
10.1128/JCM.01492-10subject
Has Abstractpub_date
2011-05-01 00:00:00pages
1843-52issue
5eissn
0095-1137issn
1098-660Xpii
JCM.01492-10journal_volume
49pub_type
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