Volume 3, Number 3—September 1997
Using a Mathematical Model to Evaluate the Efficacy of TB Control Measures
|Pulmonary ventilation p(m3/min)||Room volume V(m3)||No. of susceptible persons S0||
No. of uninfected persons
|Exposure time t (min)||Infection rate q (qpm)||Disinfection rate C (ACH)|
|Abscess irrigation||6 x 10-3a||200b||5||1||150b||38||6b|
|Intubation||6 x 10-3a||3000||3||1||66||514||2.4d|
aSurgical masks were adopted.
bEstimated value; actual data are not available
cWe assumed S=0.001≈0.
dIn the emergency department where this outbreak developed, 60% of the air was recirculated without filtration; we assumed an airflow rate of 6 ACH, obtaining an effective disinfection rate equal to 40% of 6 ACH.