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Different Mycobacterium avium subsp. paratuberculosis MIRU-VNTR patterns coexist within cattle herds
K J E van Hulzen1, H C M Heuven, M Nielen
1Department of Farm Animal Health, Utrecht University, PO Box 80.151, 3508 TD Utrecht, The Netherlands. K.J.E.vanHulzen@uu.nl
Veterinary Microbiology
|November 2, 2010
Summary
Understanding Mycobacterium avium subsp. paratuberculosis (MAP) genetic diversity is key for paratuberculosis control. This study found multiple MAP strains can coexist within infected dairy herds, impacting disease epidemiology.
Area of Science:
- Veterinary Microbiology
- Epidemiology
- Genetics
Background:
- Mycobacterium avium subsp. paratuberculosis (MAP) causes paratuberculosis, a significant disease in cattle.
- Understanding MAP's genetic diversity is crucial for effective disease control and epidemiological insights.
Purpose of the Study:
- To investigate the genetic diversity of bovine MAP isolates.
- To determine if multiple MAP strains can coexist within dairy herds endemic for paratuberculosis.
Main Methods:
- Utilized PCR-based Variable-Number Tandem Repeats (VNTRs) and Mycobacterial Interspersed Repetitive Units (MIRUs) analysis.
- Analyzed 52 temporal MAP isolates from 32 commercial dairy herds.
Main Results:
- Detected 17 distinct MIRU-VNTR patterns among the 52 isolates.
- Six out of eleven herds with multiple isolates showed more than one MIRU-VNTR pattern.
- Confirmed coexistence of multiple MAP genotypes within single dairy herds.
Conclusions:
- Bovine MAP exhibits significant genetic diversity, with multiple strains coexisting within farms.
- This genetic variability influences paratuberculosis epidemiology and necessitates tailored control strategies.
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