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. Author manuscript; available in PMC: 2011 Aug 15.

Published in final edited form as: Clin Infect Dis. 2010 Aug 15;51(4):401–408. doi: 10.1086/655129

Figure 2A&B — A: The effect of ventilation (air changes per hour, ACH) and mean period of infectivity (delta, Δ) on the mean annual risk of TB infection resulting from a child sleeping in a shack shared with adults. Values are plotted for mean periods of adult infectivity of 30, 60, 90 and 120 days.

B: The effect of period of infectivity (delta, Δ) and ventilation (air changes per hour, ACH) on the mean annual risk of TB infection resulting from a child sleeping in a shack shared with adults. Values are plotted for 2, 6 and 12 air exchanges per hour (ACH).

N.B. The period of infectivity (delta, Δ) is the mean time from onset of infective tuberculosis until initiation of effective antituberculosis chemotherapy. Modeled estimations are based on a potential night-time exposure of 12 hours, a median of 2.2 adult residents per shack, a 1.35% annual risk for smear-positive tuberculosis and a mean production of 1 infectious air-borne quantum of TB per hour during untreated smear-positive disease.

Figure 2A&B — A: The effect of ventilation (air changes per hour, ACH) and mean period of infectivity (delta, Δ) on the mean annual risk of TB infection resulting from a child sleeping in a shack shared with adults. Values are plotted for mean periods of adult infectivity of 30, 60, 90 and 120 days.

B: The effect of period of infectivity (delta, Δ) and ventilation (air changes per hour, ACH) on the mean annual risk of TB infection resulting from a child sleeping in a shack shared with adults. Values are plotted for 2, 6 and 12 air exchanges per hour (ACH).

N.B. The period of infectivity (delta, Δ) is the mean time from onset of infective tuberculosis until initiation of effective antituberculosis chemotherapy. Modeled estimations are based on a potential night-time exposure of 12 hours, a median of 2.2 adult residents per shack, a 1.35% annual risk for smear-positive tuberculosis and a mean production of 1 infectious air-borne quantum of TB per hour during untreated smear-positive disease.

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