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Kate F. Hurley, DVM, MPVM Koret Shelter Medicine Program...
Transcript of Kate F. Hurley, DVM, MPVM Koret Shelter Medicine Program...
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Kate F. Hurley, DVM, MPVM
Koret Shelter Medicine Program Director
Center for Companion Animal Health
University of California, Davis
www.sheltermedicine.com
www.facebook.com/sheltermedicine
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• Direct contact
• FOMITES
• Hairborne
• Sneeze-borne
• Airborne
• But not for cats
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• Dose required = immune
status of animal ÷
virulence of germ
• Reduce dose by reducing
source and/or
decreasing transmission
• Increase dose tolerated
by supporting animal
immunity
Thresh-hold for infection
Systemic spread
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• Protect animals from
disease
• Protect staff, client and
visitor health
• Create a pleasant and
welcoming environment
• Protect the environment
and use resources wisely
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• Waste time, money and
chemicals with process
that fails to work
• Spread disease to
animals and/or staff
• Cause toxicity to animals
and workers
???
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Choose the right products
• Pathogens, environment, time, staff
Choose the right process of application
Choose the right places to be sanitized
• people, equipment, surfaces, animals
Write everything down
Check efficacy periodically
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• Activity: cleaner, disinfectant, degreaser
• Spectrum of effect: un-enveloped viruses, ringworm, others
• Contact time
• Activity in the face of organic matter
• Penetration into porous surfaces
• Ease of application
• Potential toxicity
• Cost
No need to rotate disinfectants per se
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Alcohol Sodium hypochlorite
aka Bleach
Accelerated hydrogen
peroxide
(e.g. AccelHP)
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Sodium dichloro-
isocyanurate
e.g. Bruclean
Quaternary
ammonium
Calcium
hypochlorite
e.g. Wysiwash
Potassium
peroxymonosulfate
e.g. Trifectant, Virkon
Chlorhexidine
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Alcohol Sodium hypochlorite
aka Bleach
Accelerated hydrogen
peroxide
(e.g. AccelHP)
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Sodium dichloro-
isocyanurate
e.g. Bruclean
Quaternary
ammonium
Calcium
hypochlorite
e.g. Wysiwash
Potassium
peroxymonosulfate
e.g. Trifectant, Virkon
Chlorhexidine
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Alcohol
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Quaternary
ammonium Chlorhexidine
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• E.g. anything that contains the suffix “–onium” or the prefix “quat-” • Roccal, Triple Two, Parvo-sol, Lemon-
quat…
• Modest detergent activity
• Good with organic matter relative to bleach
• Relatively effective against Giardia
• Flexible application including hose-end and central systems
• BUT…
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1. Scott, F.W., Virucidal disinfectants and feline viruses. Am J Vet Res, 1980.
41(3): p. 410-4.
2. Kennedy, M.A., et al., Virucidal efficacy of the newer quaternary ammonium
compounds. Journal of the American Animal Hospital Association, 1995.
31(3): p. 254-8.
3. Eleraky, N.Z., L.N. Potgieter, and M.A. Kennedy, Virucidal efficacy of four new
disinfectants. J Am Anim Hosp Assoc, 2002. 38(3): p. 231-4.
4. Eterpi, M., G. McDonnell, and V. Thomas, Disinfection efficacy against
parvoviruses compared with reference viruses. Journal of Hospital Infection,
2009. 73(1): p. 64-70.
Un-enveloped viruses include canine parvovirus, feline
panleukopenia and calicivirus
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Alcohol Sodium hypochlorite
aka Bleach
Accelerated hydrogen
peroxide
(e.g. AccelHP)
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Sodium dichloro-
isocyanurate
e.g. Bruclean
Quaternary
ammonium
Calcium
hypochlorite
e.g. Wysiwash
Potassium
peroxymonosulfate
e.g. Trifectant, Virkon
Chlorhexidine
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Alcohol Sodium hypochlorite
aka Bleach
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Sodium dichloro-
isocyanurate
e.g. Bruclean
Calcium
hypochlorite
e.g. Wysiwash
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• Sodium hypochlorite
• A.ka. bleach
• Sodium dichloroisocyanurate
• E.g. Bruclean
• Calcium hypochlorite
• E.g. Wysiwash
• Proven efficacy against un-enveloped viruses
• Must be applied to pre-cleaned surface
• Inactivated by organic matter
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• 24 hours
• 7 days
• 1 month
• 3 months
• AccelTB
• Trifectant
• Bleach
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• 24 hours
• 7 days
• 1 month
• 3 months
• AccelTB
• Trifectant
• Bleach IF in a light proof
container
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Alcohol Sodium hypochlorite
aka Bleach
Accelerated hydrogen
peroxide
(e.g. AccelHP)
http://www.sheltermedicine.com/shelter-health-portal/information-sheets/sanitation-in-animal-shelters
Sodium dichloro-
isocyanurate
e.g. Bruclean
Quaternary
ammonium
Calcium
hypochlorite
e.g. Wysiwash
Potassium
peroxymonosulfate
e.g. Trifectant, Virkon
Chlorhexidine
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• Unenveloped viruses: sodium hypochlorite (1:30), sodium dichloroisocyanurate, accelerated hydrogen peroxide, potassium peroxymonosulfate
• Ringworm: cleaning then sodium hypochlorite at 1:10, verify efficacy via fungal culture
• Organic matter (wood, carpets, yards, porous surfaces…): peroxygen with surfactant, high quality quaternary ammonium
• Quick turnaround: accelerated hydrogen peroxide, potassium peroxymonosulfate
• Pre-packaged system: Bru-clean, Wysiwash, AccelTB, various quaternary ammonium compounds
• Mechanical cleaning, sunlight and drying always helpful
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• Bleach + detergent = OK!
• Bleach + quaternary ammonium = OK!
• Any disinfectant + hot water = OK!
• Quaternary ammonium + detergent = possible inactivation
• Potassium peroxymonosulfate or accelerated hydrogen peroxide + bleach = noxious fumes, inactivation of PP
• Bleach + ammonia = deadly gas
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• Incorrectly diluted…
A. Phenol (e.g. Lysol)
B. Sodium hypochorite (Bleach)
C. Quaternary ammonium (e.g. Roccal)
D. Potassium peroxymonosulfate (e.g. Trifectant)
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• Oral and skin ulceration, high fever, rhinitis, vomiting, anorexia, pulmonary edema, pneumonia, neurological signs, death • Adelson L, Sunshine I. Fatal poisoning due to a cationic detergent of the
quaternary ammonium compound type. Am J Clin Pathol 1952;22:656-61.
• Grier RL. Quaternary ammonium compound toxicosis in the dog. J Am Vet Med Assoc 1967;150:984-7.
• Serrano LJ. Dermatitis and death in mice accidentally exposed to quaternary ammonium disinfectant. J Am Vet Med Assoc 1972;161:652-5.
• Trapani M, Brooks DL, Tillman PC. Quaternary ammonium toxicosis in cats. Lab Anim Sci 1982;32:520-2.
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• Remove source
• Dilute with milk/water if
ingested
• Bathe
• Broad spectrum
antibiotics
• Pain control
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• Prominently post dilution instructions
• Provide all needed equipment and measuring devices
• Tie them down if needed
• Closed containers
• Light-proof for bleach
• Note storage/remix times for each product
• Label with product, expiration date and initials
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• Allows cleaning without
disruption of animals
• Limits chemical exposure
of animals
• Saves time (no holding
area to clean)
• Avoids tracking in and
out of dog kennels
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• Patrick, D., F. G, et al. (1997). "Residual moisture determines the level of touch-contact-associated bacterial transfer following handwashing. ." Epidemiology and Infection 119 (3): 319-325.
• We report here a new and critical determinant of the effectiveness of hand hygiene procedures, namely the amount of residual moisture left on the hands after washing and drying. When samples of skin, food and utilities were touched with wet, undried hands, microbial numbers in the order of 68000, 31000 and 1900 respectively translocated to these representative surfaces. Bacterial numbers translocating on touch contact decreased progressively as drying with an air or cloth towel system removed residual moisture from the hands. A 10 s cloth towel–20 s air towel protocol reduced the bacterial numbers translocating to skin, food and utilities on touch contact to 140, 655 and 28 respectively and achieved a 99·8, 94 and 99% reduction in the level of bacterial translocation associated with wet hands. Careful hand drying is a critical factor determining the level of touch-contact-associated bacterial transfer after hand washing and its recognition could make a significant contribution towards improving handcare practices in clinical and public health sectors.
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• Clean thoroughly
between residents
• “Spot clean” on a
daily basis
• Exception for litters,
seriously messy cages
• Ringworm?
• Okay for URI, mild
illness
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• Open and close cage
doors quietly
• Think about latches when
you’re choosing cages
• Replace litter pans
calmly, especially metal
on metal
• Feed after things have
quieted down or before
things get crazy
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• Only for dogs vaccinated > 3-5 days • Tracking in and out of run can
spread disease
• No urine or feces on that side of run
• Replace water, soiled bedding
• Replace food if present
• Leave clean-ish bedding in place
• Clean and dry side with urine or feces as needed
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• Increase in gut motility in response to stomach distention
• Can occur as soon as 15 minutes after a meal
• Consider feeding dogs ~ 30 minutes before cleaning time/walkies to reduce soiling of runs during the day
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A. One minute
B. Ten minutes
C. Two hours
D. It depends
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• Dependent on disinfectant type, temperature, presence of organic matter, concentration, pathogen
• E.g. drop of ~10 C increased necessary sodium hypochlorite exposure time ~ 2 fold
• Cold, dirty, poor penetration, tough or unknown pathogen: err on the long side for contact time
• No time for contact: optimize temperature, concentration, and product (e.g. accelerated hydrogen peroxide, potassium peroxymonosulfate)
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• Dependent on pathogen, success of mechanical cleaning and disinfection • No closure needed if
you’re confident of disinfection
• Closure may be inadequate if you’re not confident of disinfection
• Consider 3 full cleaning/drying cycles • Staff to initial each one
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www.glogerm.com
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• Focus on:
• High contact surfaces, people and body parts
• 1st few hours
• 1st 24 hours
• 1st 3-5 days
• Juveniles always
• Separating populations rather than individuals
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A. Hands B. Clothes C. Feet
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• We experienced a methicillin-resistant Staphylococcus aureus (MRSA) outbreak in two wards at our medical school teaching hospital during the period of July-September 1997. To determine whether these MRSA clinical isolates were associated with environmental factors, we conducted two sequential MRSA surveys of the hospital staff and surroundings in wards with outbreaks and in one ward without an outbreak…Samples were obtained from the nares, fingers, white coats, and stethoscope of 7 doctors and 7 nurses, and from six surrounding areas of the hospital ward. MRSA strains were detected mainly from white coats. This suggested a high probability of cross-infection between the patients and the hospital staff in the ward. Our observations suggest that doctors and nurses should be cautious that their coats might be contaminated with the prevailing strains of MRSA.
Osawa, K., C. Baba, et al. J Infect Chemother 9(2): 172-7. (2003).
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35 times as much contamination on scrub top versus hand
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• Change of clothing
• Arm coverage
• Between areas/activities
• Especially prior to handling new
intakes, youngsters, after
handling sick animals,
euthanasia and AFTER
CLEANING
• Risk assessment between
individuals
• Effective laundering
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Remove large food
particles, feces, etc.
Hot water, soap & bleach
(1/2 cup per load for
standard washer)
Dry completely
Do NOT overload
machines
Separate clean from dirty
laundry
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A. B.
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• Reduction factors (RFs) for bacterial counts on examiners' hands were compared when performing a standardized equine physical examination, followed by the use of one of 3 hand-hygiene protocols (washing with soap, ethanol gel application, and chlorohexidine-ethanol application)…The RFs were significantly different (P < 0.0001) between the hand-washing group and the other 2 treatment groups (the alcohol-gel and the chlorhexidine-alcohol lotion). The use of alcohol-based gels or chlorhexidine-alcohol hand hygiene protocols must still be proven effective in equine practice settings, but in this study, these protocols were equivalent or superior to hand washing for reduction in bacterial load on the hands of people after they perform routine physical examinations.
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• Often superior to
handwashing
• 60-80% ethanol or
isopropyl alcohol
• Emollients to protect skin
• 20-30 seconds, all
surfaces
• Within 3 feet of point of
care
Hand hygeine: hours of youtube fun
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• Handwashing • After contamination with
feces, blood, body fluids etc.
• After inadvertent exposure to durable organisms
• Thorough drying
• Gloves when it counts • Planned exposure to
durable organisms, feces, blood, etc.
• Wash hands after removal
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A. Quaternary
ammonium
B. Sodium hypochlorite
C. Potassium
peroxymonosulfate
D. Phenolic disinfectant
E. All were equally
ineffective
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1. Hartmann FA, Dusick AF, Young KM. Impact of disinfectant-
filled foot mats on mechanical transmission of bacteria in a
veterinary teaching hospital. J Am Vet Med Assoc
2013;242:682-688.
2. Stockton KA, Morley PS, Hyatt DR, et al. Evaluation of the
effects of footwear hygiene protocols on nonspecific bacterial
contamination of floor surfaces in an equine hospital. J Am Vet
Med Assoc 2006;228:1068-1073.
3. Morley PS, Morris SN, Hyatt DR, et al. Evaluation of the
efficacy of disinfectant footbaths as used in veterinary
hospitals. J Am Vet Med Assoc 2005;226:2053-2058.
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• Sodium hypochlorite and quaternary ammonium footbaths did not reduce bacterial count on boots
• Potassium peroxymonosulfate did reduce bacterial count, but no reduction on floors
• Dedicated boots or shoe covers for serious risk • E.g. canine GI
• Ringworm
• Don’t let cats run around on the floor during cleaning
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• Create and post written
procedures
• Train staff and volunteers
• Check periodically
• Discover and punish any
slip ups
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• Create and post written
procedures
• Train staff and volunteers
• Check periodically
• Discover and punish any slip
ups
• Reward and acknowledge
careful cleaning as well as
noting the absence there-of
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• www.glogerm.com
• Concentration test strips • E.g. www.sanitationtools.com
• Bacterial and fungal culture of
environment
• Chapter 16 for ringworm details
• Periodic observation
• Dilution
• Application
• Handling
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