Rabies & Animal Bite ManagementRabies & Animal Bite Management The Public Health Perspective James...
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Rabies & Animal Bite ManagementRabies & Animal Bite Management
The Public Health PerspectiveThe Public Health Perspective
James Kazmierczak, DVM, MS State Public Health Veterinarian
1
Wisconsin Division of Public HealthDecember, 2012
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Rabies BasicsRabies Basics
• Genus Lyssavirus (Rhabdoviridae)
– Rabies virus = type species
– Other lyssavirus species orgenotypes cause rabies like diseasegenotypes cause rabies-like disease (e.g., Duvenhage virus, Mokolavirus, Lagos bat virus, European
• Viral disease of the CNS - fatal
& Australian lyssaviruses)
Viral disease of the CNS fatal
• Virus primarily shed in saliva, inoculation via bite, to CNS, then
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back out to salivary glands
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RABIES PATHOGENESISRABIES PATHOGENESIS• Virus typically transmitted via bite• Incubation period typically 30 – 90p yp y
days (extremes = 5 days to > 6 yrs)• Virus initially binds to / multiplies in
myocytes• Virus highly neurotropic & enters
i h lperipheral nerves• Centripetal travel by retrograde flow in
axoplasm of nerves to CNSaxoplasm of nerves to CNS• Replicates in brain
C t if l fl t i t d
Bite
3
• Centrifugal flow to innervated organs, including the salivary glands viral excretion in saliva
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Animal Rabies in Wisconsin, 1962 Animal Rabies in Wisconsin, 1962 –– 20112011
300
350
200
250
ases
50
100
150Ca
0
50
1962
1967
1972
1977
1982
1987
1992
1997
2002
2007
4
Year
Total Skunks Others
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Animal Rabies in Wisconsin, 1989 Animal Rabies in Wisconsin, 1989 –– 20112011
Sk k B t Oth
50
60
Skunks Bats Other
30
40
50
es`
20
30
Cas
0
10
198
199
199
200
20089 94 99 04 09
Year5
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Animal Rabies Diagnosed in Wisconsin 2006 Animal Rabies Diagnosed in Wisconsin 2006 –– 20102010
DouglasBatSkunk
DogBayfield
AshlandSawyerWashburn
Polk Barron Rusk
Price
Iron
Vilas
Oneida
Marinette
FlorenceBurnett
Dog
o
Lincoln
TaylorChippewaSt. Croix
Pierce
Dunn
Eau Claire
Clark Marathon
Shawano
Menominee
Oconto
LangladeForest
Marinette
Pepin
Buffalo
TrempealeauJackson
Monroe
Wood Portage
Juneau
AdamsLaCrosseMarquette
Waushara
Calumet
Manitowoc
Kewaunee
Brown
OutagamieWaupaca
ShawanoDoor
2 Domestic2 Dogs
Winnebago
SaukVernon
Crawford
Richland
G t
DaneIowa
Columbia Dodge
Jefferson
Ozaukee
SheboyganFond du LacGreen Lake
Washington
123 Wild
121 Bats2 Skunks
2 Dogs
6
Grant
LaFayettteGreen Rock
Waukesha
Walworth
Kenosha
RacineMilwaukee
125 = TOTAL
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Percentage of submissions that are rabies positiveby species, Wisconsin 2001-2010
5.56
y p ,
43.4
4
posi
tive
0 8
1.62% p
0.04 0.03
0.8
00Dog Cat Cow Horse Bat Skunk
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Estimated Annual Human Rabies Cases during ~1985Estimated Annual Human Rabies Cases during ~1985--20052005
North America 4 – 8 (fox, skunks, raccoons, insectivorous bats)
Europe 10 – 20 (fox, bats)Latin America 200 – 400 (dog vampire bats)Latin America 200 400 (dog, vampire bats)
ddogDogDog
8dog,
mongooseDog, Dog,
mongoosemongoose
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Reported Human Rabies Cases, USA, 1945 Reported Human Rabies Cases, USA, 1945 -- 20112011(Arrows represent occurrences of WI cases)
45
(Arrows represent occurrences of WI cases)
30
35
40
20
25
30
Cas
es
10
15
C
0
5
45 50 55 60 65 70 75 80 85 90 95 00 05 10
194
195
195
196
196
197
197
198
198
199
199
200
200
201
Year9
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Animal Bites in the USA
•Animal bites account for ~ 1% of all E.D. visits
•Estimated 4,700,000 sustain dog bite annually
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•Approximately 800,000 seek medical care for dog bite
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Human Rabies Human Rabies -- ProdromeProdrome
• Fever, chills, malaise, ,
• Generally vague respiratory,Generally vague respiratory,gastrointestinal, or neurologicsymptomssymptoms
• Paresthesia at or near bite site• Paresthesia at or near bite site
E ti ll i bl t d tEssentially incurable, even at prodrome stage11
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Human Rabies Human Rabies -- Neurologic StageNeurologic Stage• Furious Form (~ 80%):
- hallucinations, agitation- thrashing, biting, runningg g g- hydrophobia / aerophobia- fluctuating mental status
l• Paralytic Form:- weakness, flaccid paralysis sometimes starting in
bitten extremity- paraplegia, quadriplegia- ascending paralysis
Eith F• Either Form: - fever, nuchal rigidity, muscle fasciculation, seizures- typically complete paralysis by day 10
• Coma Death (typically flat EEG by day 14) 12
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Is Rabies in the RuleIs Rabies in the Rule--out?out?
NotifyNotify Infection Control ifInfection Control if rabies is suspectedrabies is suspectedNotify Notify Infection Control if Infection Control if rabies is suspectedrabies is suspected(Contact precautions & face shield)(Contact precautions & face shield)
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Is Rabies in the RuleIs Rabies in the Rule--out?out?• Suggestive hx?• Signs or symptoms of encephalitis or myelitis, including g y p p y , g
autonomic instability, dysphagia, hydrophobia, paresis, & paresthesia – Neurologic signs are progressiveW / d d b th t f d b• Were neuro s/sx preceded by three to four days by a nonspecific prodrome?
• Negative tests for other etiologies of encephalitisNegative tests for other etiologies of encephalitis
Rabies is very unlikely if:• Improvement or no change in neuro status over time• Illness longer than 2-3 week duration
15http://www.cdc.gov/rabies/specific_groups/doctors/index.html
• Lack of fever
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AnteAnte--mortem mortem Diagnosis Human RabiesDiagnosis Human Rabies• Contact DPH prior to submission of specimens• Submit: Saliva (PCR) – NOT sputum or trach aspirate Serum (antibody) CSF ( tib d ) CSF (antibody) nuchal skin biopsy (DFA – include at least 10 hair follicles)
• T ti f d t CDC• Testing performed at CDC
Brief patient hx required
http://www.cdc.gov/rabies/specific_groups/doctors/index.html
Brief patient hx required Reluctant to test unless clinically suggestive & all 4
specimens are submitted
16http://www.mcw.edu/Pediatrics/InfectiousDiseases/PatientCare/Rabies.htm
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Prevention and ManagementPrevention and ManagementPrevention and ManagementPrevention and Managementof Potential Exposuresof Potential Exposurespp
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Rabies PreRabies Pre--Exposure VaccinationExposure Vaccination•Recommended for travelers to
endemic areas, veterinary staff,ldl f h b l l kwildlife rehabilitators, spelunkers,
rabies laboratorians, etc.
P i i V i 3•Primary series: Vaccine x3 - IM injection into deltoid (day 0, 7, and 21 or 28)
d l d d d h•Periodic serology recommended to determine whenbooster is required if risk of exposure is ongoing
- Frequency of testing is determined by level of riskq y g y- Assays should measure neutralizing antibody
•Does not eliminate the need for post-exposure
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p pprophylaxis after a recognized exposure(abbreviated regimen)
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Rabies PostRabies Post--Exposure Prophylaxis (RPEP)Exposure Prophylaxis (RPEP)
For persons not previously vaccinated*
Immediate cleansing of wound with soap & water: 10-15 minutes
1) Human rabies immune globulin (HRIG) on day 0- 20 IU per kg, infiltrated at wound site to extent possible- give any remaining HRIG IM at site distal from vx
2) Vaccine (HDCV or PCEC) - 1 ml into deltoid, days 0, 3, 7, &14(if immune compromised, add 5th vx on d. 28 and check titer post-vx)
For persons previously vaccinated*1) Vaccine x2: 1 ml into deltoid days 0 and 3
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1) Vaccine x2: 1 ml into deltoid, days 0 and 32) Do not use HRIG
*Consult public health officials or ACIP statement for definition of “previously vaccinated”
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What constitutes an exposure ?What constitutes an exposure ?
An exposure requires:
1) Presence of infective virus- typically in saliva, but also neural tissue, CSF
f- contact with blood, urine, feces does not constitutean exposure per CDC
- rabies virus considered noninfectious in dried material
2) The potentially infectious material must come in contact with an open wound, scratch, abrasion,
l for mucosal surface20
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Types of ExposuresTypes of Exposures
BITE
NON-BITE (rare)
potentially infective material in contact withmucous membrane or break in the skin
- consider fomites, scratchesconsider fomites, scratches
tissue transplants
ingestion ingestion
inhalation
bat “exposures” warrant special consideration21
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Epidemiology of Human Rabies in USAEpidemiology of Human Rabies in USA
32 human deaths 1990 - 2000
Acquired abroad, all due to canine rabies variant = 6
Acquired in USA = 26q
due to canine rabies variant = 2
due to bat rabies variant = 24- known bite = 3
- known contact = 7known contact 7
- exposure unknown = 1422
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Bat ExposuresBat ExposuresRationale:•Majority of bat variant
associated human cases hadassociated human cases hadno definite history of a bite
(bite/scratch likely went unnoticed)
Recommendation:•Consider RPEP if physical contact occurred and unable
to exclude possibility of bite or scratch unless bat isto exclude possibility of bite or scratch unless bat isnegative upon lab testing
•Consider RPEP when person has been in close physicalproximity to a bat and physical contact cannot be excluded,unless bat is negative upon lab testing- Being in the same room as a bat does NOT constituteg
exposure in a competent awake adult- RPEP is not routinely advised for entire household 23
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Wound inflicted by canine teeth ofEptesicus fuscus (big brown bat) while bat was being handled;while bat was being handled; Picture taken same day as bite
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f
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“The photo was taken within 5 - 10 minutes of the bite. The brown dots are blood spots that disappeared
after a cleansing with soap and water.”
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Guidelines for potential rabies exposures in WisconsinGuidelines for potential rabies exposures in Wisconsin
Animal species Condition of Animal Disposition of animal Tx of victim
Dog, Cat,Healthy andavailable
- Confine & observe animal for 10 days No RPEP unless animalg, ,
Ferret(regardless of
vx status)
available - No RPEP unless animaldevelops signs of rabies
- Sacrifice & test animal)Rabid or suspectas rabid
Sacrifice & test animalASAP
- Begin RPEP, discontinueif negative
Why?Why?
Period of asxPeriod of asx--icic if negative
Unknown( d)
- Notify authorities;consider search for animal
Period of asxPeriod of asx icicviral shedding isviral shedding isknown for theseknown for thesespeciesspecies
(escaped) consider search for animal - RPEP often indicated
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Guidelines for potential rabies exposures in WisconsinGuidelines for potential rabies exposures in Wisconsin
Animal species Condition of Animal Disposition of animal Tx of victim
Skunk, bat, fox,R d bid
- Kill and test animal raccoon, coyote,wolf, opossum,bobcat, or other
Regard as rabidunless proven otherwise by lab
ASAP
- Do NOT hold for obser ation,
carnivores, whether wild orkept as pets
observation
- RPEP indicated unless specimen is negativep p specimen is negative on lab test
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Guidelines for potential rabies exposures in WisconsinGuidelines for potential rabies exposures in Wisconsin
Animal species Disposition of animal Tx of victim
Bites from large rodents(woodchucks, beavers, muskrats)handled as those from wildRodents, rabbits/hares,
whether wild or kept as pets
handled as those from wild carnivores, i.e.- presume rabid unless proven negative by lab
Bites from small herbivorous rodents (squirrels, hamsters, ( q , ,guinea pigs, gerbils, chipmunks,rats, mice) virtually never call for RPEP or testing of animal if it was behaving normally at the time of the bite. 28
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Overarching Principles for CliniciansOverarching Principles for Clinicians
1) D b i RPEP if h ff di1) Do not begin RPEP if the offending animal is available for either observationor testingor testing.► There are rare exceptions – consult PH
2) Bats aside, non-bite exposures resultingin human rabies are extremely rare. ► Consult with PH before initiating
RPEP for non-bites
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Why report animal bites?
Animal bites are not reportable conditions under WI law
BUTBUT For most animal bites, no way to make a rational
decision re. RPEP without follow up on the animaldecision re. RPEP without follow up on the animal
Providers unable to provide this follow up
SO ...Public health or law enforcement must be notified
id f ll i ito provide follow up quarantine or testing
No prohibition against doing so (Privacy rules expresslypermit disclosures of public health interest, without prior consentpermit disclosures of public health interest, without prior consentof patients, to public health agencies so that public health activitiessuch as disease control and prevention can continue.) 30
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Rabies Diagnosis and Specimen SubmissionSpecimen SubmissionJames W. Powell, M.S.Wisconsin State Labo ato of H gieneWisconsin State Laboratory of HygieneDecember 11, 2012
WISCONSIN STATE LABORATORY OF HYGIENEWISCONSIN STATE LABORATORY OF HYGIENE
WISCONSIN STATE LABORATORY OF HYGIENEWISCONSIN STATE LABORATORY OF HYGIENE 31
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Rabies Specimens by Yearp y25.003000
15 00
20.00
1800
2400
imen
s
10.00
15.00
1200
1800
. of
Spec
i
0 00
5.00
0
600No
0.000
Specimens Bats % Positive
WISCONSIN STATE LABORATORY OF HYGIENEWISCONSIN STATE LABORATORY OF HYGIENE
Specimens Bats % Positive
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I t f R bi Di iImportance of Rabies Diagnosis
• Patient management: positive, negative indeterminate or not done
lresults• Surveillance
WISCONSIN STATE LABORATORY OF HYGIENEWISCONSIN STATE LABORATORY OF HYGIENE
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The success of rabiesThe success of rabies diagnosis depends on …
• The quality of the specimen b itt d S i b i isubmitted. Specimen submission
involves multiple steps and test quality d d ti i i h tdepends on optimizing each step
WISCONSIN STATE LABORATORY OF HYGIENEWISCONSIN STATE LABORATORY OF HYGIENE
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Division of Public Health Guidelines for specimen submission
1989 Guidelines for fee exempt testing• 1989 Guidelines for fee exempt testing• Requirements
H man or domestic animal e pos re– Human or domestic animal exposure– The exposing animal must pose a risk for
transmitting rabies.g
• Most tests are fee exemptp
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Does the specimenpneed to be submitted?
• Was there human exposure?• Was there domestic animal exposure?Was there domestic animal exposure?• Does the exposing animal have a risk of
transmitting rabies?g– Low Risk animals; small rodents, rabbits– High Risk animals; all other wild animals, domestic
animals with CNS signs– Quarantine
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Specimen PreparationSpecimen Preparation
• Humane euthanasia-avoid damage to the• Humane euthanasia avoid damage to the skull www.avma.org/issues/animal_welfare/euthanasia.pdf
• Animal is decapitatedAnimal is decapitated• Brain submitted (the alternative)• Unsuitable specimens• Unsuitable specimens
– Decomposed, crushed, shot, chemically treated, cooked
– If the suitability of the specimen cannot be determined, please call the laboratory.
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Humane euthanasiaHumane euthanasia
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Packaging Goalsg g
• Prevent Leakage and maintain specimen integrity– Multiple layers of containment; specimen
bag, foam container (seamless), outer plastic bag, cardboard
– Reusable cool packs (not ice cubes)– Packing Materials– Frozen specimens
– Clinical Orders (608-265-2966)
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C ca O de s (608 65 966)
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WSLH ShippersWSLH Shippers
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WSLH ShiWSLH Shippers
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DocumentationDocumentation• 8 ½ by 11 Requisition Form
Human exposures• Human exposures• Animal exposures• Animal submitted, by whom and the
ownerN b f i l– Number of animals
• Additional victims• Additional testing at WVDL-specific
form
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Documentation Problems
• Multiple specimens (same victim) in the same box, not documented,
• Multiple specimens (different victims) in the same box no clear descriptionin the same box, no clear description
• Physician name not provided in human exposureshuman exposures
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Shippingpp g• Maximum 24 hour transit time• Hand delivery distance versus need• Hand delivery-distance versus need• Commercial vendors
Priority Mail Ground UPS– Priority Mail, Ground UPS– Guaranteed Overnight; UPS, Federal Express
DHL Dunham (at your expense)DHL, Dunham (at your expense)
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Aft H D liAfter Hours Delivery
N l b i h 7 45• Normal business hours; 7:45-4:30 M-FS t d h ( i• Saturday hours (specimen receiving only); 6:30-2:30
• All other times, contact UW Police and Security (608-262-Police and Security (608-262-2957)
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OutlineOutline
• Does the animal need to beDoes the animal need to be submitted?
• Specimen Preparation• Specimen Preparation• Specimen Packaging• Documentation• Diagnosis• Reporting
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Rabies DiagnosisRabies Diagnosis
• Specimen receipt and identificationp p• Necropsy• Brain dissection• Brain dissection• Impression smears• Fixation• Fixation• Staining with rabies specific and
labeled antibodieslabeled antibodies• Reading slides
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NecropsyNecropsy
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Brain Sectionsfor Rabies Diagnosis
Cerebellum Brainstem HippocampiCerebellum Brainstem Hippocampi
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Brain Tissue ImpressionsBrain Tissue Impressions
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Slide FixationSlide Fixation
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StainingSta g
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MicroscopyMicroscopy
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FluorescenceFluorescence
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OutlineOutline
• Does the animal need to be• Does the animal need to be submitted?S i P ti• Specimen Preparation
• Specimen Packaging• Documentation• DiagnosisDiagnosis• Reporting
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Result Reporting:Result Reporting:Positive
• Phoned results• Hardcopy– Physician
– Veterinarian/submitterLHD
• Hardcopy– Physician– Submitter– LHD – Submitter– LHD
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Result Reporting:Result Reporting:Indeterminate/Not Done Specimens
• PhonedPhysician (human) H d– Physician (human)
– Veterinarian (Animal)
• Hardcopy– Physician (human)
Veterinarian( )– LHD
– Veterinarian– LHD
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Result Reporting:Result Reporting:Negative
• PhonedBy request H d– By request • Hardcopy
– Physician (human)Veterinarian/submitter– Veterinarian/submitter
– LHD
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WSLH WebpageWSLH Webpagewww.slh.wisc.edu
• Left hand column; click on “Communicable Disease Division”
• Click on “r” in the a to z listC c o t e a to st• Click on “rabies”• Pick the topic of interest from the• Pick the topic of interest from the
menu
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