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Washington DC Hospital Study
Twelve month analysis of microbial contamina=on within a Neonatal Intensive Care Unit – Pre and Post
installa=on of Ultra Violet Germicidal Irradia=on system in the NICU HVAC
*Unpublished data
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Study Sample Loca=ons
Qualita=ve & quan=ta=ve environmental samples collected from: HVAC cooling coils, condensate drain pans and final filters
NICU Supply air grilles, return air grilles and sinks
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WDCH Study Results
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Microorganisms isolated from WDCH NICU Environment
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GUH NICU HVAC Surfaces- AHU-2: Bacteria & Fungi
8/8/2007 Pre UVGI
9/5/2008 Pre UVGI
2/4/2009 Post UVGI
3/31/2009 Post UVGI5/29/2009Post UVGI 2/10/2010
Post UVGI
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
1 2 3 4 5 6
Sample Date
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.WDCH NICU HVAC Surfaces – AHU-‐2: Bacteria & Fungi
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10/6/2008 Pre UVGI
3/31/2009 Post UVGI2/10/10 Post UVGI
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.
1 2 3Sample Date
GUH NICU Environment- SA Grille: Bacteria & FungiWDCH NICU Environment – SA Grille: Bacteria & Fungi
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10/6/2008 Pre UVGI
3/31/2009 Post UVGI 2/10/2010 Post UVGI
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.
1 2 3Sample Date
GUH NICU Environment- RA Grille: Bacteria & FungiWDCH NICU Environment – RA Grille: Bacteria & Fungi
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10/6/08 Pre UVGI
3/31/09 Post UVGI
2/10/10 Post UVGI
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.
1 2 3Sample Date
GUH NICU Environment- Sinks: Bacteria & FungiWDCH NICU Environment – Sinks: Bacteria & Fungi
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Comparison of WDCH pre and post data to Women and Children’s Hospital of Buffalo pre and post
data
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Similar Microorganisms Cultured from NICU Environments
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Environmental Samples – NICU HVAC
WDCH WCHOB
GUH NICU HVAC Surfaces- AHU-2: Bacteria & Fungi
8/8/2007 Pre UVGI
9/5/2008 Pre UVGI
2/4/2009 Post UVGI
3/31/2009 Post UVGI5/29/2009Post UVGI 2/10/2010
Post UVGI
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
1 2 3 4 5 6
Sample Date
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.
NICU HVAC Surfaces – AHU-‐2: Bacteria & Fungi
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Environmental Samples – NICU Air Diffusers
WDCH WCHOB
10/6/2008 Pre UVGI
3/31/2009 Post UVGI2/10/10 Post UVGI
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
Avg
. Mic
roor
gani
sms
CFU
/SQ
. IN
.
1 2 3Sample Date
GUH NICU Environment- SA Grille: Bacteria & FungiNICU Environment – SA Grille: Bacteria & Fungi
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WCHOB Hospital Costs
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Conclusions from Women and Children’s Hospital of Buffalo Study
Most problema=c bacteria related to Hospital Acquired Infec=ons were isolated in HVAC and NICU air grilles: Acinetobacter, Pseudomonas, Staphylococcus
HVAC microbial contamina=on (Bacteria and Fungi) was reduced by a factor of > 5 Logs
Reduced Ven=lator Associated Pneumonia (VAP)
Reduced an=microbial use
Reduced an=microbial resistance
Reduced morbidity and mortality
Reduced Hospital direct costs > $800,000/annum
.
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Conclusions from Washington DC Hospital Study
Most problema=c bacteria related to Hospital Acquired Infec=ons were isolated in HVAC and NICU air grilles: Acinetobacter, Pseudomonas, Staphylococcus
HVAC microbial contamina=on (Bacteria and Fungi) was reduced by a factor of > 5 Logs
NICU air diffuser microbial contamina=on was reduced by a factor of >5 Logs
NICU Chief has indicated NICU infec=ons are drama=cally down with 0 VAP (Ven=lator Associated Pneumonia) infec=ons reported in past 27 months