vaporized hydrogen peroxide decontamination of two ... · absa nd52 annual conference, miami,...

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ABSA 52 nd Annual Conference, Miami, Florida, October 1821, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination Vaporized Hydrogen Peroxide Decontamination of Two Specialized Animal Transport Units Two Specialized Animal Transport Units Lesley Homer, RBP, CBSP Regional Biocontainment Laboratory f b h University of Pittsburgh

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Page 1: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

ABSA 52nd Annual Conference, Miami, Florida, October 18‐21, 2009Session XIV: ROUND TABLE: Inactivation and Decontamination

Vaporized Hydrogen Peroxide Decontamination of Two Specialized Animal Transport UnitsTwo Specialized Animal Transport Units

Lesley Homer, RBP, CBSP

Regional Biocontainment Laboratory 

f b hUniversity of Pittsburgh

Page 2: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Animal Transport ComponentsComponents

Mobile transfer cart

Page 3: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Animal Transport ComponentsComponents

Plastic isolator

Page 4: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Transport Units:D t i ti N dDecontamination Needs

1. Cart remains in ABSL‐3– Mobile transfer cart– Interior decontamination required prior to transporting a different animal/pathogen

2. Cart comes out of ABSL‐3– Mobile transfer cart

Interior and exterior decontamination required– Interior and exterior decontamination required to remove cart for service and certification

3 Cart comes out of ABSL‐33. Cart comes out of ABSL‐3– Plastic isolator– Interior and exterior decontamination required to release cart for the next transportto release cart for the next transport

Page 5: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

The VHP Process

VHP ports

VHP 100‐P unitVHP sensor 0‐2000 ppm

VHP sensor 0.0‐20.0 ppmBiological & chemical indicators (Geobacillus spores)

Page 6: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

The VHP Process

70

80

450

500

50

60

300

350

400

Aeration

20

30

40

150

200

250 %  HumidityVHP, PPM

Decontamination

0

10

0

50

100

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

Time in Minutes

Conditioning: T=10 minutes

Condition

Dehumidify

Conditioning:  T=10 minutesDecontamination: T=25 minutesAeration:  T=55 minutes

Page 7: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Mobile Transfer Cart:  Cart Remains in ABSL 3

• Done between pathogens

Cart Remains in ABSL‐3

• Interior is treated with VHP

• Must clean and surface‐disinfect prior to VHP

• VHP hoses connected directly to cartVHP hoses connected directly to cart

• 30 min VHP + 3 hr aeration

• Reopen valves after cycle; restore fresh air to interior

S d f• Same‐day reuse of cart

Page 8: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Mobile Transfer Cart:  Cart Remains in ABSL‐3Cart Remains in ABSL‐3

Results:R l 3 ti• Ran cycle 3 times

• 29/30 biological indicators failed to grow • Cycle parameters are considered validatedy p• For future cycles, will use 4 BI/CI per cycle

Lessons Learned:Lessons Learned:• Less labor‐intensive• Rapid turnaround time; same‐day to release/reuse equipment• Real‐time [VHP] not yet available• Battery‐operated fan important to distribute VHP• No corrosion or deleterious effect on cart• No corrosion or deleterious effect on cart

Page 9: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Both Carts:R f ABSL 3

VHP in an effective decontamination room:

Remove from ABSL‐3

– Fill room with VHP and maintain at cidal level

– Prevent leakage of VHP 

– No harm to nearby people, animals

Page 10: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Tape on door from soiled corridor into airlock VHP of Carts in Airlock

FAN

in Airlock

C t204 ft3 Cart204 ft

FAN FAN

Tape on door from suite into airlock

Plastic on door from airlock into suite

Tape on door from suite into airlock

Page 11: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

VHP of Carts in Airlockin Airlock

Page 12: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

VHP of Carts in Airlockin Airlock

Page 13: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Indicators

Page 14: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Sequence of Events, Carts in Airlock

Date Procedure Personnel

Day 1 Clean and sanitize cart,move to treatment room.

2 vet techs

Stage cart and airlock with indicators. BSOgTape door and place plastic.

Connect VHP equipment to room. Place fans.Tape last door.

BSO

Adjust supply and exhaust air.Start  VHP cycle.Monitor VHP level in animal suite.

Operations ManagerBSO1 vet tech

Complete VHP cycle. Operations ManagerComplete VHP cycle.Begin to adjust supply and exhaust air.

Operations ManagerBSO

Day 2 Retrieve indicators and incubate.Move cart to clean airlock.

BSO or Vet tech

Day 3 Read indicator results.Release cart to clean area.

BSO or Vet tech

Page 15: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Cycle Parameters:Carts in AirlockCycle Phase Air Flow 

SCFMTimeMin.

Injection Rate

Other

Dehumid. 15 0‐10 ‐‐‐‐ Hum = 7.6 mg/L

Condition 15 20 10 g/min ‐‐‐

Decon 15 45 7 g/min ‐‐‐

Aeration 15 60 ‐‐‐ ‐‐‐Aeration 15 60 ‐‐‐ ‐‐‐

Biological Indicator #

Location Day 1 result

Day 7 result

1 Northeast airlock wall near floor Negative Negative2 Southeast corner of airlock behind cage 

railingNegative Negative

3 North/Northeast wall near ceiling Negative Negative4 West wall behind cage railing Negative Negative

Placement of BI

4 West wall behind cage railing Negative Negative5 South wall of airlock Negative Negative6 Top of mobile transfer cart on exhaust 

filterNegative Negative

7 Inside mobile transfer cart, NW corner  Negative Negativenear ceiling

8 Inside MTC, N corner on floor Negative Negative9 Inside MTC, SE corner near ceiling Negative Negative10 Inside MTC, S corner on floor Negative Negative

Page 16: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Results, Carts in Airlock

• 21 cart treatments done, 5 treatments of other equipment in airlockairlock.

• Pre‐cleaning and sanitation of animal carts must be done.

• Multiple cycles run with 10+ indicators per cycle.p y p y– Carts:  168 total BI, 13 total positive BI at day 7.

• After engineering control incident and corrective actions, the validation was repeated and acceptedvalidation was repeated and accepted.

• “Validation”:  – Usually NMT 10% positive BI in triplicate.

– If >10% positive BI, take corrective actions, then repeat validation.

• Post‐validation, require at least 4 BI/CI per cycle.

Page 17: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Lessons Learned, Carts in Airlock 

• Must clean and surface‐disinfect prior to VHP

• Labor‐intensive process requiring 3 days to release equipment

• Airlock is not available for animal transport or waste processing during the treatmentduring the treatment

• Number and position of oscillating fans is key for distributing VHP

• Equipment with doors must be opened and facing fans

• Equipment with motors and fans should be left running to circulate VHP through internal systems

• No corrosion or deleterious effect on carts or other equipment• No corrosion or deleterious effect on carts or other equipment treated including electronics

Page 18: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Conclusions and Wish List

Conclusions:• VHP treatment can be used to decontaminate animal 

transport equipment without damagetransport equipment without damage.

• Interior‐only VHP decon of mobile transfer cart is rapid and less intrusive to research and husbandry.

• Use of soiled ABSL‐3 suite airlocks is necessary forUse of soiled ABSL 3 suite airlocks is necessary for decontamination of plastic cart and other equipment that needs to be released from the ABSL‐3 facility.

Wish list:  • Dedicated VHP room; plastic isolator with VHP ports.

Page 19: Vaporized Hydrogen Peroxide Decontamination of Two ... · ABSA nd52 Annual Conference, Miami, Florida, October 18‐21, 2009 Session XIV: ROUND TABLE: Inactivation and Decontamination

Special thanks to

RBL Management Team:

K ll St f C l Ph D Di tKelly Stefano Cole, Ph.D., Director

Dan Fisher, Operations Manager

Amy Hartman Ph D Research ManagerAmy Hartman, Ph.D., Research Manager

Dennis Heflin, Support Services Manager

Doug Reed, Ph.D., Aerobiology Director

Anita Trichel, D.V.M., Ph.D., Clinical Veterinary Director