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Home >> Publications >> Integrating social contact and environmental data in evaluating tuberculosis transmission in a South African township.

Publication

Author(s):

Andrews JR, Morrow C, Walensky RP, Wood R.

Pub Title:

Integrating social contact and environmental data in evaluating tuberculosis transmission in a South African township.

Pub Date:

Aug 15 2014

Pub Region(s):

Southern Africa

Page Number:
597-603

Journal:

Title: 
Journal of infectious Diseases
Link: 
http://jid.oxfordjournals.org/content/early/2014/03/07/infdis.jiu138.long

PubMed: 24610874
Pub PDF: PDF icon 24610874.pdf

Abstract
Background. Population models of tuberculosis transmission have not accounted for social contact structure and the role of the environment in which tuberculosis is transmitted.Methods. We utilized extensions to the Wells-Riley model of tuberculosis transmission, using exhaled carbon dioxide as a tracer gas, to describe transmission patterns in an endemic community. Drawing upon social interaction data and carbon dioxide measurements from a South African township, we created an age-structured model of tuberculosis transmission in households, public transit, schools and workplaces. We fit the model to local data on latent tuberculosis prevalence by age.Results. Most tuberculosis infections (84%) were estimated to occur outside of one's own household. 50% of infections among young adults (ages 15-19) occurred in schools, due to high contact rates and poor ventilation. Despite lower numbers of contacts in workplaces, assortative mixing among adults with high rates of smear-positive tuberculosis contributed to transmission in this environment. Households and public transit were important sites of transmission between age groups.Conclusions. Consistent with molecular epidemiologic estimates, a minority of tuberculosis transmission was estimated to occur within households, which may limit the impact of contact investigations. Further work is needed to investigate the role of schools in tuberculosis transmission.

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Citation:

Andrews JR, Morrow C, Walensky RP, Wood R. Integrating social contact and environmental data in evaluating tuberculosis transmission in a South African township. J Infect Dis. 2014 Mar 8. [Epub ahead of print] PubMed PMID: 24610874.