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Journal of Clinical Microbiology, 07 1996, 1617-1621, Vol 34, No. 7
R Bauerfeind, S Benazzi, R Weiss, T Schliesser, H Willems and G Baljer
Mycobactin J-dependent mycobacterial isolates from sheep, goat, and cattle
herds with Johne's disease in Morocco, South Africa, the United States, and
Germany were tested for the repetitive insertion sequence IS900 of
Mycobacterium paratuberculosis by PCR. The IS900 PCR target sequence was
detected in 90 of 93 fecal culture isolates tested (96.8%). Restriction
fragment length polymorphisms (RFLPs) and in vitro growth characteristics
were studied in 46 of the IS900-positive isolates and in two bovine vaccine
strains of M. paratuberculosis. Five different RFLP types were identified
in PvuII digests of genomic DNA by Southern hybridization with a DNA probe
specific for IS900. All isolates of M. paratuberculosis could be classified
into two major clusters by their growth rates as well as the relatedness of
their PvuII-RFLP hybridization patterns. All of the sheep isolates were
classified into cluster I (extremely slow growth), while all cattle and
goat isolates were members of cluster II (moderately slow growth).
Different PvuII-RFLP patterns were detected in different sheep flocks from
Morocco and South Africa. Our results demonstrate that genetically and
phenotypically different strains of M. paratuberculosis were present in
ruminant populations. The strains from sheep in Morocco and South Africa
tested in the study appeared to belong to a unique group of M.
paratuberculosis strains that might have adapted to this host species. The
presence of several genetically distinct strains in different sheep flocks
suggested that analysis of IS900-specific RFLP patterns may provide a
useful tool for the epidemiologic investigation of ovine paratuberculosis
outbreaks.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Molecular characterization of Mycobacterium paratuberculosis isolates from sheep, goats, and cattle by hybridization with a DNA probe to insertion element IS900
Institut fur Hygiene and Infektionskrankheiten der Tiere, Justus-Liebig- Universitat Giessen, Germany.
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