Back-to-Africa introductions of Mycobacterium tuberculosis as the main cause of tuberculosis in Dar es Salaam, Tanzania
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View abstract on PubMed
Summary
This summary is machine-generated.Tuberculosis (TB) genotypes in Tanzania differ in prevalence due to bacterial factors like transmission rates and infectious period duration, not virulence. Early introduction and high transmission explain the dominant L3.1.1 genotype
Area Of Science
- Microbiology
- Epidemiology
- Genetics
Background
- High tuberculosis (TB) prevalence settings often show distinct Mycobacterium tuberculosis complex (MTBC) genotype prevalence differences.
- Factors driving these prevalence disparities in MTBC genotypes remain unclear.
Purpose Of The Study
- To investigate the drivers of MTBC genotype prevalence in Dar es Salaam, Tanzania.
- To analyze the relationship between MTBC genotype characteristics and epidemic dynamics.
Main Methods
- Utilized whole-genome sequencing (WGS) on 1,082 patient-derived MTBC samples from Dar es Salaam over six years.
- Correlated MTBC genotype data with clinical information to assess transmission rates, infectious period duration, fitness, virulence, and bacterial load.
Main Results
- The TB epidemic in Dar es Salaam is shaped by multiple MTBC genotypes introduced globally over the last 300 years.
- Key differences among dominant MTBC genotypes lie in transmission rates and infectious period duration, not overall fitness or virulence during active TB.
- The high prevalence of the L3.1.1 genotype is attributed to its early introduction and high transmission rate.
Conclusions
- Bacterial factors, specifically transmission dynamics and introduction history, are critical determinants of TB epidemic structure in Dar es Salaam.
- MTBC genotypes exhibit evolved life-history traits influencing their prevalence, independent of host co-existence duration.
- Understanding these bacterial determinants is crucial for controlling TB in high-endemicity regions.
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