Longitudinal dynamics of herd-level Mycobacterium bovis MLVA type surveillance in cattle in Northern Ireland 2003-2016
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
31786341
DOI
10.1016/j.meegid.2019.104131
PII: S1567-1348(19)30357-0
Knihovny.cz E-resources
- MeSH
- Breeding MeSH
- Genotyping Techniques veterinary MeSH
- Longitudinal Studies MeSH
- Minisatellite Repeats * MeSH
- Multilocus Sequence Typing veterinary MeSH
- Mycobacterium bovis classification genetics growth & development isolation & purification MeSH
- Risk Factors MeSH
- Cattle MeSH
- Population Surveillance MeSH
- Tuberculosis, Bovine diagnosis epidemiology MeSH
- DNA Copy Number Variations MeSH
- Animals MeSH
- Check Tag
- Male MeSH
- Cattle MeSH
- Female MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Geographicals
- Northern Ireland epidemiology MeSH
Investigating genetically-structured diversity in pathogen populations over time is important to better understand disease maintenance and spread. Herd-level surveillance of Mycobacterium bovis genotypes (multi-locus VNTR analysis types, MLVA types) from all culture-confirmed bovine tuberculosis (TB) herd cases was undertaken in Northern Ireland (NI), generating an unparalleled, longitudinal, population-level 14-year survey for this pathogen. Across this population, 295 genetically-distinct M. bovis MLVA types were identified in the 19,717 M. bovis isolates surveyed. Of these, the most frequent was MLVA type 002 (23.0%); 151 MLVA types were represented more than once, in groups ranging from 2 to 4438 isolates. Only 23 MLVA types were isolated in all 14 years. Investigating inter-annual frequency of M. bovis MLVA types, examples of statistically-significant expansions (MLVA types 002, 004, 006, 009 and 027), contractions (MLVA types 001, 007 and 011) and maintenance (MLVA types 003 and 005) were disclosed, during a period of fluctuating bovine TB herd-level incidence at the NI scale. The fixed period frequency distribution of MLVA types remained highly right-skewed. Novel VNTR copy number variant MLVA types (N = 242; an average of 17 per annum) were identified throughout the survey. The MLVA type distribution in the landscape was not random; MLVA types showed statistically-significant geographical localization and strong spatial associations with Divisional Veterinary Office (DVO) regions. There was also evidence of differential risk of particular MLVA types across breeds (Holstein/Friesian vs. other), age-class, and sex and some evidence of an association between the number of animals testing positive for bovine TB during the disclosing test and particular MLVA types, although there was substantial variation.
Veterinary Sciences Division Agri food and Biosciences Institute Agriculture House Dublin 2 Ireland
Veterinary Sciences Division Agri food and Biosciences Institute current address
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