3.86 CFU pcm2
, a further reduction of
88.72% and total reduction over 24 hours of 96.11%. At 7pm the count remained low at 4.19 CFU pcm2
97.87% after 36 hours. In the trial room using technology 2, live CFU surface counts from close to the entrance door decreased overnight from 1.21 CFU pcm2 0.51 CFU pcm2
at 7pm, to at 7pm. This equates to a
further reduction in CFUs of 57.85% and a total reduction over 24 hours of 99.83%. This count remained low at 7pm at 1.32 CFU pcm2
, a total reduction over
36 hours of 99.56%. At the back of the room, CFU surface counts were reduced overnight from 0.78 CFU pcm2 0.28 CFU pcm2
to , a further reduction of
64.11% and total reduction over 24 hours of 99.89%. At 7pm the count also remained low at 1.02 CFU pcm2
,
an overall reduction of 99.59% after 36 hours.
Culture results From swabs taken on day one culture plates from both rooms showed growth of the following bacterial species (sub species identification was not always possible): Staphylococcus, Pseudomonas, Streptococcus, Haemophilus influenzae, Escherichia coli, and Campylobacter.
Fig 2. Air particle counts. 0 0 0.1 1 7am 5 5000 5000 15000 15000 10000 10000 , a total reduction of
30000 30000 25000 25000 20000 20000
5000 0
10000 5000 0.1 1 5 12 hours 0
On day 2 it was not possible to grow any bacterial species from any swabs in either room using a culture technique.
Analysis
The starting surface CFU counts per cm2 were similar in both rooms on day 1. At the main entrance door to both rooms the count was similar 246.97 CFU pcm2
15000 10000 10000 5000 5000 0
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INFECTION PREVENTION
Air cleaning tech – Entrance Air cleaning tech – Back of room
Disinfecting tech – Entrance Disinfecting tech – Back of room
0.1 Time/Microns
1 24 hours
5
0.1
1 36 hours
5
(air tech room) as compared to 291.96 CFU pcm2
and 246.82 CFU pcm2
(surface tech room). Similarly,
the counts were approximately the same at the back of both rooms 196.57 CFU pcm2
respectively. As both rooms were in use by multiple people all day (on both days), it would be expected that these CFU counts would rise. However, in both
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Pathology In Practice September 2024 Revolutionise your ELISA
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Air particle counts
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