Transcript Media-specific disinfection (Air and Surface)

Media-Specific Disinfection
Surfaces and Air
Legal Issues
1) It is a violation of Federal law to use an EPA
registered product in a manner inconsistent with its
labeling.
– Solution strength must be according to label
– Applications must be on the label
2) It is a violation of Federal law for a manufacturer to
make real or implied claims for efficacy against
organisms which are not on the label.
– Creates problems when we encounter:
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FMDV
Anthrax
Norwalk
SARS
Avian Influenza H5N1
Surface Disinfection
• Surface Disinfection = Inactivation in Place
• Surface Cleaning = Removal of Contaminants
• Commercial products frequently combine disinfection
and cleaning.
• Some disinfectants have cleaning properties
• Recommendation (at least in clinical settings) clean
with disinfectant to avoid spreading contamination
Pre-Disinfect  Clean  Disinfect
Surfaces
• What surfaces might you need to disinfect?
– Household Surfaces
– Food and Food Prep Surfaces
– Clinical Surfaces
– Laboratory
– Industrial
– Farm
– Other???
Concerns for Disinfection of Surfaces
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Disinfectant Type/Concentration/Formulation
Contact Time
Type of Organisms/Level of Disinfection
Corrosivity and Other Surface Damage
Toxicity/Residual Toxicity
Other Residues
Odor
Type of Application and Rate
Concerns for Disinfection of
Surfaces
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pH
Demand and Interfering Substances
Temperature
Water hardness
Soil load
Biofilm presence
Surface microtopography
Precleaning
Relative humidity
Compatibility
Storage of Product/Product age
Clinical/Dental Surface Disinfectants
Farm Surfaces
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Virkon S (potassium peroxymonosulfate)
Nolvasan S (chlorhexidine diacetate)
Bleach (sodium hypochlorite)
Spectrasol (quat)
Alcohols (ethanol and Isopropanol, 70-95%)
Roccal D (quats with bis-n-tributylin oxide)
Surface Disinfection
• In study by CRA Foundation
– 54 clinical surface disinfectants tested against TB and
Polio with and without presence of Blood
– 7 passed:
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Household Chlorox (50:50)
Industrial Chlorox (50:50)
Biosurf
Lysol I.C.
Lysol II Spray
Indi-wipes with Lysol
Ozone Surface Disinfection
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Up to 14 PPM Ozone
@ 10GPM
Onboard Ozone
Analyzer With Alarms
Exclusive Off-Gassing
System
Spray, Mist and Fog
Applicators; Spray
Arches Available
Advertises a 3 Log Kill
on First Application
UV Surface Disinfection
• Conveyor Belts
• Food Prep Surfaces
• Laboratory and
Clinical Surfaces
• Sterilization of
Packaging
• Mail Systems
Cleaning and Disinfection of
Floors
% Reduction
Soap and water
80.4%
Phenol
99.0%
Microbial Contamination of Mop
Water
Before cleaning
Soap
(CFU/ml)
10
After cleaning one- 650
third of ward
After cleaning two- 15,000
thirds of ward
After cleaning
34,000
complete ward
Phenol
(CFU/ml)
20
10
30
20
Disinfection of Food Surfaces
Chemical disinfection of Indoor Air
• Spraying
– relatively large particles,
which have a higher
wetting capacity, but stay in
the air for less time
• Misting
– smaller particles that have
increased penetration and
uniformity
• Fumigation
– combination of 2 or more
chemicals producing a
vaporised form of the
disinfectant
• Thermal Fogging
– similar to misting but
involving heating of the
disinfectant to produce a
fine vapour
Chemical Disinfectants of Air
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Chlorine Dioxide
Ozone
VHP
Formaldehyde
Gluteraldehydes
Quat mixtures
Virkon (peroxy compound)
Sporocidin (phenolic)
Air Disinfection
• Chemical Disinfection
– Spray, mist, fog, fumigation
• UVGI
• Ionization/Electrostatic Precipitation
– Only one that removes
• Photocatalytic oxidation
UV Air Disinfection
• Forced Air or HVAC Duct
Systems
• Full Air Systems
• Upper Air Systems
• Re-circulating Systems
• Microbial Growth Control
– On Filter Surfaces
UV Air Disinfection: Duct Systems
• Integrated in to HVAC System
UV Air Disinfection: Upper Air
• Originally designed
for TB sanitariums
UV Air Disinfection: MGS