Mycobacterium tuberculosis transmission in Birmingham, UK, 2009–19: An observational study

Over 10-years of whole-genome sequencing (WGS) of Mycobacterium tuberculosis in Birmingham presents an opportunity to explore epidemiological trends and risk factors for transmission in new detail. Between 1st January 2009 and 15th June 2019, we obtained the first WGS isolate from every patient resi...

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Published in:The Lancet regional health. Europe 2022-06, Vol.17, p.100361-100361, Article 100361
Main Authors: Walker, Timothy M., Choisy, Marc, Dedicoat, Martin, Drennan, Philip G., Wyllie, David, Yang-Turner, Fan, Crook, Derrick W., Robinson, Esther R., Walker, A. Sarah, Smith, E. Grace, Peto, Timothy E.A.
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Language:English
Subjects:
Epidemiology
Mycobacterium tuberculosis
Seasonality
Transmission
Whole genome sequencing
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description Over 10-years of whole-genome sequencing (WGS) of Mycobacterium tuberculosis in Birmingham presents an opportunity to explore epidemiological trends and risk factors for transmission in new detail. Between 1st January 2009 and 15th June 2019, we obtained the first WGS isolate from every patient resident in a postcode district covered by Birmingham's centralised tuberculosis service. Data on patients’ sex, country of birth, social risk-factors, anatomical locus of disease, and strain lineage were collected. Poisson harmonic regression was used to assess seasonal variation in case load and a mixed-effects multivariable Cox proportionate hazards model was used to assess risk factors for a future case arising in clusters defined by a 5 single nucleotide polymorphism (SNP) threshold, and by 12 SNPs in a sensitivity analysis. 511/1653 (31%) patients were genomically clustered with another. A seasonal variation in diagnoses was observed, peaking in spring, but only among clustered cases. Risk-factors for a future clustered case included UK-birth (aHR=2·03 (95%CI 1·35–3·04), p 
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subjects Epidemiology
Mycobacterium tuberculosis
Seasonality
Transmission
Whole genome sequencing
title Mycobacterium tuberculosis transmission in Birmingham, UK, 2009–19: An observational study
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