Media specific disinfection
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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

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Media-Specific Disinfection

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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:

    • 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

  • 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

  • pH

  • Demand and Interfering Substances

  • Temperature

  • Water hardness

  • Soil load

  • Biofilm presence

  • Surface microtopography

  • Precleaning

  • Relative humidity

  • Compatibility

  • Storage of Product/Product age

*In practice, the contaminating microorganisms are not usually known.


Clinical/Dental Surface Disinfectants


Farm Surfaces

  • 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:

      • Household Chlorox (50:50)

      • Industrial Chlorox (50:50)

      • Biosurf

      • Lysol I.C.

      • Lysol II Spray

      • Indi-wipes with Lysol


Ozone Surface Disinfection

  •   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


Microbial Contamination of Mop Water


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

  • 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


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