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[Border-crossing source tracing in tuberculosis via DNA fingerprint technique]
A Kiers1, A P Drost, D van Soolingen
1GGD, afd. Tuberculosebestrijding, Leeuwarden.
Nederlands Tijdschrift Voor Geneeskunde
|November 16, 1996
Summary
Modern DNA analysis, or restriction fragment length polymorphism (RFLP), effectively mapped a tuberculosis outbreak in the Netherlands. This technology identified the source case, proving invaluable for public health investigations.
Area of Science:
- Molecular Epidemiology
- Infectious Disease Control
Background:
- Tuberculosis (TB) transmission investigations often involve complex contact tracing.
- Identifying the index case is crucial for controlling outbreaks.
Observation:
- A large-scale TB investigation in Harlingen, Netherlands, identified 276 infected individuals, including 49 with active TB.
- Restriction fragment length polymorphism (RFLP) analysis revealed a common Mycobacterium tuberculosis DNA pattern in 27 active TB cases linked to the index patient.
Findings:
- RFLP analysis successfully identified a specific 'Harlingen' type DNA pattern, linking numerous cases to the index patient.
- The source patient of the outbreak was traced to England, demonstrating the international reach of TB transmission.
- Despite extensive tracing, three additional patients with the same DNA pattern were identified later, with their connection remaining unclear.
Implications:
- Restriction fragment length polymorphism (RFLP) is a powerful tool for elucidating TB transmission pathways.
- Effective source tracing, aided by DNA analysis, is essential for managing and preventing TB outbreaks.
- This study highlights the utility of molecular techniques in modern public health surveillance.