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Home >> Publications >> Shared air: a renewed focus on ventilation for the prevention of tuberculosis transmission.

Publication

Author(s):

Richardson ET, Morrow CD, Kalil DB, Bekker LG, Wood R.

Pub Title:

Shared air: a renewed focus on ventilation for the prevention of tuberculosis transmission.

Pub Date:

May 7 2014

Pub Region(s):

Southern Africa

Journal:

Title: 
PLoS One
Link: 
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4012987/

PubMed: 24804707
Pub PDF: PDF icon 24804707.pdf

Abstract
BACKGROUND:
Despite an improvement in the overall TB cure rate from 40-74% between 1995 and 2011, TB incidence in South Africa continues to increase. The epidemic is notably disquieting in schools because the vulnerable population is compelled to be present. Older learners (age 15-19) are at particular risk given a smear-positive rate of 427 per 100,000 per year and the significant amount of time they spend indoors. High schools are therefore important locations for potential TB infection and thus prevention efforts.

METHODS AND FINDINGS: Using portable carbon dioxide monitors, we measured CO2 in classrooms under non-steady state conditions. The threshold for tuberculosis transmission was estimated using a carbon dioxide-based risk equation. We determined a critical rebreathed fraction of carbon dioxide (ƒ(c)) of 1 · 6%, which correlates with an indoor CO2 concentration of 1000 ppm. These values correspond with a ventilation rate of 8 · 6 l/s per person or 12 air exchanges per hour (ACH) for standard classrooms of 180 m(3).

CONCLUSIONS: Given the high smear positive rate of high-school adolescents in South Africa, the proposal to achieve CO2 levels of 1000 ppm through natural ventilation (in the amount 12 ACH) will not only help achieve WHO guidelines for providing children with healthy indoor environments, it will also provide a low-cost intervention for helping control the TB epidemic in areas of high prevalence.

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Citation:

Richardson ET, Morrow CD, Kalil DB, Bekker LG, Wood R. Shared air: a renewed focus on ventilation for the prevention of tuberculosis transmission. PLoS One. 2014 May 7;9(5):e96334. doi: 10.1371/journal.pone.0096334. eCollection 2014. PubMed PMID: 24804707; PubMed Central PMCID: PMC4012987.