ArticleJournal of clinical microbiology2001
Molecular epidemiology of Mycobacterium tuberculosis in Norway.
Article in Journal of clinical microbiology, 2001. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 1 of them a synthesis that pooled it.
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Who cites it
18 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Laboratory Cross-Contamination of Mycobacterium tuberculosis: A Systematic Review and Meta-analysis.Lung · 2019Pooled it
- Transmission of tuberculosis between foreign-born and Finnish-born populations in Finland, 2014-2017.PloS one · 2021Article
- False-Positive Mycobacterium tuberculosis Detection: Ways to Prevent Cross-Contamination.Tuberculosis and respiratory diseases · 2020Article
- Genomic Diversity of Mycobacterium tuberculosis Complex Strains in Cantabria (Spain), a Moderate TB Incidence Setting.PloS one · 2016Article
- Clustered tuberculosis in a low-burden country: nationwide genotyping through 15 years.Journal of clinical microbiology · 2012Article
- Evidence for waning of latency in a cohort study of tuberculosis.BMC infectious diseases · 2010Article
- The epidemiology of tuberculosis in Europe.Archives of disease in childhood · 2007Review
- Patient and health care system delays in the start of tuberculosis treatment in Norway.BMC infectious diseases · 2006Article
- New route of importation of Mycobacterium tuberculosis Beijing genotype.Emerging infectious diseases · 2006Article
- Analysis of Mycobacterium tuberculosis genotypes in Madrid and identification of two new families specific to Spain-related settings.Journal of clinical microbiology · 2005Article
- Systematic molecular characterization of multidrug-resistant Mycobacterium tuberculosis complex isolates from Spain.Journal of clinical microbiology · 2005Article
- Treatment outcome of new culture positive pulmonary tuberculosis in Norway.BMC public health · 2005Article
- Continued low rates of transmission of Mycobacterium tuberculosis in Norway.Journal of clinical microbiology · 2003Article
- Epidemiology of tuberculosis on Gran Canaria: a 4 year population study using traditional and molecular approaches.Thorax · 2003Article
- Deciphering an outbreak of drug-resistant Mycobacterium tuberculosis.Journal of clinical microbiology · 2003Article
- Molecular epidemiology of tuberculosis in a sentinel surveillance population.Emerging infectious diseases · 2002Article
- Molecular epidemiology of multidrug-resistant tuberculosis, New York City, 1995-1997.Emerging infectious diseases · 2002Article
- Spread of drug-resistant Mycobacterium tuberculosis strains of the Beijing genotype in the Archangel Oblast, Russia.Journal of clinical microbiology · 2002Article
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4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The incidence of tuberculosis in Norway is one of the lowest in the world, and approximately half of the cases occur in first- and second-generation immigrants. In the present study, the genetic diversity of 92% of all strains of Mycobacterium tuberculosis isolated in Norway in 1994 to 1998 was assessed using restriction fragment length polymorphism (RFLP) analysis, with the insertion sequence IS6110 and the repetitive element DR as probes, to determine the degree of active transmission between patients. The DR probe was used as a secondary molecular marker to support or rule out clustering of strains with fewer than five copies of IS6110. After exclusion of 20 cultures representing laboratory contamination, 573 different IS6110 patterns were found among the 698 strains analyzed. Of these 573 patterns, 542 were observed only once and 31 were shared by 2 to 14 isolates. Among 81 strains (11.5%) carrying fewer than five copies of IS6110, 56 RFLP patterns were found when the results of both the IS6110 and DR methods were combined. Among the 698 strains, 570 were considered to be independent cases. A total of 14.5% of the native Norwegians and 19.7% of the foreign patients were part of a cluster. Thus, the degree of recent transmission of tuberculosis in Norway is low and the great majority of the cases are due to reactivation of previous disease. Transmission between immigrants and native Norwegians is uncommon. Two outbreaks, one among native Norwegians and one mainly among immigrants, have been ongoing for several years, indicating that, even in a low-incidence country such as Norway, with a good national program for tuberculosis surveillance, certain transmission chains are difficult to break.
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