The Removal and Inactivation of
Prions
December 6th to 8th, 2007
Bydgoszcz, Poland
Peter Newson
Marketing Manager -EMEA
The Removal and Inactivation of Prions / Peter Newson
1
© 2007 By STERIS Corporation. All rights reserved.
Agenda
1. Introduction
1. Subject
2. Risks
3. Standards
1. Prion introduction
3. Cleaning
1. Decontamination
2. Prion inactivation
The Removal and Inactivation of Prions / Peter Newson
2
© 2007 By STERIS Corporation. All rights reserved.
Target
Inactivation of prions on infectious proteins
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
The subject
" Contaminated surgical instruments
need to be cleaned to remove soil
and infectious items and proteins
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Soil-A Dirty Subject
" Implications of inefficient cleaning
Visually unacceptable devices
Ineffective disinfection and sterilization
Device damage
Adverse patient outcomes
Accidental prion transmission
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Increased Attention
" Visually unacceptable devices
Cancelled procedures
" Device damage
Dried on soil / salt deposits
" End toxins
" TASS
Toxic Anterior Segment Syndrome
Outbreak in the USA
Cataract surgery
Inadequate cleaning and/or water
residuals
The Removal and Inactivation of Prions / Peter Newson
6
© 2007 By STERIS Corporation. All rights reserved.
What has Changed since 2000 ?
" The Science of cleaning
" Understanding of Prions
" Revolution in Prion Decontamination
New Investigations
New products
" New Regulatory Focus
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
What has changed& &
& & .and reasons for the development of
new and more effective decontamination
methods:
" Patient risks
" New Standards
" Increased attention
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Patient risks
" Inadequate disinfection and sterilization
" Toxin risks
" Prion diseases
Other protein disease concerns
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Standards for decontamination
" EN/ISO 15883 series
Published
" Part 1: General requirements, definitions and
tests
" Part 2: Requirements and tests for washer-
disinfectors employing thermal disinfection for
surgical instruments, anaesthetic equipment,
hollowware, utensils, glassware, etc.
" Part 3: Requirements and tests for washer-
disinfectors employing thermal disinfection for
human waste containers
In final draft (FDIS)
" Part 4: Requirements and tests for washer-
disinfectors employing chemical disinfection
for thermo-labile endoscopes
Technical Specification (TS)
" Part 5: Test soils and methods for
demonstrating cleaning efficacy of washer-
disinfectors
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Standards for sterilization
" EN/ISO 17665, Sterilization of medical devices- Information to be provided by
the manufacturer for the processing of resterilizable medical devices
" Others
Biocides directive (98/8/EC; April, 1998)
Detergents Directive (648/2004;October, 2005)
REACH (Com(03) 644)
" Registration Evaluation and Authorisation of Chemicals
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Prion introduction
" What are Prions ?
Identified as the causative agents for
a group of central nervous system
diseases
" TSEs (Transmissible Spongiform
Encephalopathies)
" vCJD, CJD (Creuzfeldt-Jacob disease)
Still debated!
" Proteins
" Appear to be devoid of nucleic acid
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Prion introduction
Prions and protein folding: The cause of vCJD appears to be the
presence of an abnormal forms of normal protein, known as a prion.
This structure makes them hard to be removed from the instruments.
- Accumulate in the body and
Causing cell death (brain).
- No more cell growth
Good Protein Bad Protein
Normal Helical form Abnormal Sheet form
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Prion decontamination
Enveloped Lipid Viruses (HIV)
" Intrinsic resistance
Prions demonstrate
Large Non-Enveloped Visruses
resistance to routine methods
Vegetable Bacteria
of decontamination and
Fungi
sterilization
Non-Enveleoped Lipid Viruses
Mycobacteria
Prions are proteins, not
Bacteria Spores
microorganisms
PRIONS ?
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Accidental transmission in practice
Source of CJD
Case 1 Case 2 Implantation
Assay
Patient (female)
Patient (female) Patient (male) Chimpanzee
Age: 69
Age: 23 Age: 17 Age: 17
Exposure Sept. 1974
Exposure Nov. 1974 Exposure Dec. 1974 Exposure Dec. 1977
Death 20 month later Death 16 month later Death 20 month later
1-2 new diseases per 1 Mio. People a Year / Global
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
STERIS Research Facility
" Fontenay-aux-Roses, Paris
Laboratory facilities
" Microbiology (Biosafety 1-3), histology
and biochemical laboratories
Atypical pathogen research
" Including Prions
In Vivo and In vitro sets where carried out
In collaboration with STERIS
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
The Removal and Inactivation of
Prions
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
The science around cleaning
" The chemistry of soil
" How much and what is present
" Detection of soil
" Cleaning indicators
" New cleaning methods
" & .How clean is clean?
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Concerns with cleaning
" Infectivity is difficult to remove from
instrument surfaces
" Drying of soil increases risk
" Improper handling increases risk
" Some standard cleaning processes
may also increase risk
" Impractical recommendations
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Considerations
" Efficacy
Data is conflicting
Testing on surfaces
" Compatibility
Surface damage
" Safety
Handling
WHO process: Emerge instruments in a
High concentration of Sodium Hydroxide
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
The cleaning process
Where should reprocessing begin?
" Point of use (OR)
" WHO, NICE, AORN Guidelines-
recommend instruments should not be
allowed to dry
Instrument transportation gel / pre-soak
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Important Detergent Concepts
" Regulations
Claims
" Safety
Safety Compatibility
Safety Compatibility
" Process
Chemistry
Contact Method, Time,
Choice
Temperature, Concentration
Water quality
" Formulation
Efficacy
Efficacy
A combination of ingredients,
including active and inert
ingredients, into a product for its
intended use
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
New Cleaning Technology
" Enzymatic formulations
Genencor
Alkaline proteases
Effect of formulation
" Advances in alkaline cleaning
" Physico-chemical cleaning
e.g., plasma
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Cleaning performance
" Cleaning performance test on static emulsion
Enzymatic Methods Log Alkaline Methods Log
Reduction Reduction
Klenzyme ~4.5 Hamo50 ~3
(1%, 65°C; 10 min.)
Enzyme Cleaner 2 ~1
Hamo50 ~6.5
Porous load autoclaving ~5.5 (1%, 70°C; 10 min.)
15 min at 121°C
CIP150 >7
Klenzyme + autoclaving ~6.5 (1,6%, 43°C; 15 min.)
Hamo100
Enzyme Cleaner 2 + autoclaving ~3.0
(1%, 65°C; 10 min.) >7
(0,8%; 43°C; 7,7 min.)
>7
Not all enzymatic & alkaline cleaners
(0,8%; 43°C; 7,7 min.); Plastic wires
>7
perform in the same way
Detergent formulations are critical for
prion inactivation & removal
The Removal and Inactivation of Prions / Peter Newson
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© 2007 By STERIS Corporation. All rights reserved.
Two in one Detergent
" Outstanding Cleaner
" Removes and Inactivates Prions
The Removal and Inactivation of Prions / Peter Newson
25
© 2007 By STERIS Corporation. All rights reserved.
Key product components
" Potassium Hydroxide (KOH)
" Surfactants
" Chelating Agents
The Removal and Inactivation of Prions / Peter Newson
26
© 2007 By STERIS Corporation. All rights reserved.
Key product components
Why Potassium Hydroxide (KOH) over Sodium
Hydroxide (NaOH)?
" Both increase the solubility of soils
" Potassium ions and salts are more soluble in water than
Sodium ions and salts
" No need to neutralize with acid
" Better Rinsing Ability!
The Removal and Inactivation of Prions / Peter Newson
27
© 2007 By STERIS Corporation. All rights reserved.
Key product components
" Surfactants- Surface Active Agent
" Penetrate soil and surface irregularities
" Ability to displace particles
No Surfactants Surfactant A Surfactant B
The Removal and Inactivation of Prions / Peter Newson
28
© 2007 By STERIS Corporation. All rights reserved.
Key product components
Chelating Agents
" Sequester hard water ions
" Keeps them in a suspension
" Prevents them re-depositing
on surface
The Removal and Inactivation of Prions / Peter Newson
29
© 2007 By STERIS Corporation. All rights reserved.
Prion Decontamination Cycle
" Manual Soak with HAMO100 PID
Fill basin with water to a temp of
43°C (keep warm)
Add 0.8% Hamo 100 PID
Submerge instruments in water
(5cm above instruments)
Typical soak time = 7.5 min
Rinse and then pass through
normal process
The Removal and Inactivation of Prions / Peter Newson
30
© 2007 By STERIS Corporation. All rights reserved.
Prion Decontamination Cycle
" HAMO 100 PID usage in washer/disinfector
The Removal and Inactivation of Prions / Peter Newson
31
© 2007 By STERIS Corporation. All rights reserved.
How does the formulation act
" Removes prions & bioburden from surfaces
" Keeps them suspended
" Inactivates through hydrolysis & allows
suspended residues to be freely rinsed
without re-adhering to the surface
" Substrate Compatibility (Instrument
materials)
The Removal and Inactivation of Prions / Peter Newson
32
© 2007 By STERIS Corporation. All rights reserved.
Hydrolysis as inactivating mechanism
" Breaks down the peptide bonds through the
introduction of water between the atoms of the
bond, thus inactivating the infectivity of the prion
The Removal and Inactivation of Prions / Peter Newson
33
© 2007 By STERIS Corporation. All rights reserved.
Degradation with Hamo 100
" >6 log reduction in prion titers against multiple
strains of prions including CJD & vCJD
" Total cleaning of ISOEN15883 part 5 test soils
incl. Edinburgh & blood soils
The Removal and Inactivation of Prions / Peter Newson
34
© 2007 By STERIS Corporation. All rights reserved.
Degradation with Hamo 100
3 mins
3 mins
Exposure
Exposure
Time
Time
7 mins
7 mins
Unexposed
Unexposed
controls
controls
%
%
Hamo100
Hamo100
263K 6PB1 BSE sCJD vCJD
Alkaline Cleaner Alkaline Cleaner Alkaline Cleaner Alkaline Cleaner Alkaline Cleaner
43°C 43°C 43°C 43°C 43°C
0.8% 1.6% 0.8% 1.6%
0.8% 1.6% 0.8% 1.6% 0.8% 1.6%
The Removal and Inactivation of Prions / Peter Newson
35
© 2007 By STERIS Corporation. All rights reserved.
Control
Control
Control
Control
Control
0.1
0.1
0.4
0.4
0.6
0.6
0.8
0.8
Conclusion
" Prions can be transmitted on device surfaces
" Methods have been developed to verify the
effectiveness of decontamination methods
" Cleaning alone can be effective
Choice of cleaner and process is important
" Disinfection and sterilisation can be effective
Choice of biocide and process is important
New methods of prion decontamination have been
identified
The Removal and Inactivation of Prions / Peter Newson
36
© 2007 By STERIS Corporation. All rights reserved.
The Removal and Inactivation of
Prions
Peter Newson
The Removal and Inactivation of Prions / Peter Newson
37
© 2007 By STERIS Corporation. All rights reserved.
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