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Volume 10, Number 6—June 2004

Perspective

Airborne Infection with Bacillus anthracis—from Mills to Mail

Kevin P. Fennelly*Comments to Author , Amy L. Davidow*, Shelly L. Miller†, Nancy Connell*, and Jerrold J. Ellner*
Author affiliations: *New Jersey Medical School–UMDNJ, Newark, New Jersey, USA; †University of Colorado, Boulder, Colorado, USA

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Table

Risk for airborne infection with Bacillus anthracis modeled for various scenarios of exposure to secondarily contaminated mail for 1 hour in a home or office, expressed as number of cases per 10,000 susceptible persons exposeda

Small room Moderate-size room House

0.5 ACH
0.5 ACH
2 ACH
2 ACH

Pulmonary ventilation
Quanta
10 L/min
10 L/min
6 L/min
4 L/min
10 L/min
6 L/min
4 L/min
4 L/min
0.001
1.0
0.2
0.1
0.1
0.05
0.03
0.02
0.006
0.01
9.8
2.0
1.2
0.8
0.5
0.3
0.2
0.1
0.1
97.8
19.6
11.8
7.9
4.9
3.0
2.0
0.6
1
936
195
117
78
49
30
20
6
10
6,256
1,784
1,113
756
479
291
195
61
100
10,000
8,599
6,928
5,443
3,881
2,555
1,784
596
1,000 10,000 10,000 9,999 9,996 9,926 9,477 8,598 4,588

aACH, air changes per hour.

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