INFECTION CONTROL
Hospital H
200 400 600 800 1000
0
200 400 600 800 1000
0
1200 1500
300 600 900
0 Hospital N 100
r = 0.9020 p <0.02
Hospital K
20 40 60 80
0
12 16 20
0 4 8
100
r = 0.8591 p <0.05
20 40 60 80
0 1000
200 400 600 800
0 Hospital L
200 400 600 800 1000
0
200 400 600 800 1000
0 Hospital O
12 15
0 3 6 9
10 20 30 40 50
0
400 800 1200 1600 2000
0
200 400 600 800 1000
0 Hospital P
Hospital I
r = 0.8590 p <0.05
10 20 30 40 50
0
300 600 900 1200 1500
0 Hospital M
r = 0.8076 p <0.10
12 24 36 48 60
0
15 30 45 60 75
0
Hospital J
12 18 24 30
r = 0.9696 p <0.01
0 6
Occupants
Figure 1: Airborne bacteria concentrations and the number of occupants versus elapsed time.
Bacteria
‘Reduction of the peak morning concentration of airborne bacterial number is expected to contribute to a reduction in hospital infections.’
Hospital H
1000 1200 1400
200 400 600 800
0 Hospital M
1200 1500
300 600 900
0
r = 0.5447 p <0.01
600 1200 1800 2400 3000
0
200 400 600 800 1000 1200 1400 1600
0
r = 0.6172 p <0.01
200 400 600 800 1000 1200 1400
0
400 800 1200 1600 2000 2400
0 Hospital N
r = 0.3134 p <0.05
200 400 600 800 1000 1200 1400 1600
0 Hospital J
r = 0.4212 p <0.01
200 400 600 800 1000 1200
0 1000
200 400 600 800
0 1000
200 400 600 800
0 Hospital P
r = 0.5486 p <0.01
r = 0.6419 p <0.01
Hospital L
200 400 600 800 1000
0
200 400 600 800 1000
0
Biologic particle Figure 2: Culturable airborne bacterial and biologic particles versus elapsed time. IFHE DIGEST 2013 29
Culturable bacteria
Biologic particle [p/m3
] 9:30
10:30 11:30 12:30 13:30 14:30 15:30
Culturable bacterial [cfu/m3 Biologic particle [x100/m3 9:30
10:30 11:30 12:30 13:30 14:30 15:30
Culturable bacterial [cfu/m3 Biologic particle [x100/m3 ] ] 9:30
10:30 11:30 12:30 13:30 14:30 15:30
Culturable bacterial [cfu/m3 ] Culturable bacterial [cfu/m3 ] Culturable bacterial [cfu/m3 Biologic particle [x100/m3 ] ] ] ] Culturable bacterial [cfu/m3 Biologic particle [x100/m3 ] ]
Biologic particle [x100/m3
]
Airbourne bacteria [cfu/m3
]
10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30
Number of occupants Airbourne bacteria [cfu/m3
]
Number of occupants Airbourne bacteria [cfu/m3
]
Number of occupants Airbourne bacteria [cfu/m3
Airbourne bacteria [cfu/m3
]
Airbourne bacteria [cfu/m3
]
]
10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00
Number of occupants Airbourne bacteria [cfu/m3
]
Number of occupants Airbourne bacteria [cfu/m3
]
Number of occupants Airbourne bacteria [cfu/m3
]
10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00
Number of occupants Number of occupants Number of occupants
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