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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine Fever Classical Swine Fever
Texas A&M University Texas A&M University
College of Veterinary MedicineCollege of Veterinary Medicine
Jeffrey Musser, DVM, PhD, DABVPJeffrey Musser, DVM, PhD, DABVP
Suzanne Burnham, DVMSuzanne Burnham, DVM
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Special thanks to:Special thanks to:
The staff at the Plum Island Animal The staff at the Plum Island Animal Diagnostic Center for sharing their images Diagnostic Center for sharing their images and presentations for all veterinarians to and presentations for all veterinarians to see on this website. see on this website.
And to Dr Corrie Brown for sharing her And to Dr Corrie Brown for sharing her presentations as well.presentations as well.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine FeverClassical Swine Fever
Classical Swine Fever is also called Classical Swine Fever is also called Hog CholeraHog Cholera
““The most typical feature of CSF:The most typical feature of CSF: it is so it is so atypicalatypical.”.”
Dr Bill WhiteDr Bill White
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine FeverClassical Swine Fever
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine Fever Classical Swine Fever
CSF is a highly contagious viral disease of CSF is a highly contagious viral disease of swine.swine.
Mortality varies from almost zero to 100%.Mortality varies from almost zero to 100%.
Only the domestic pig and wild boar are Only the domestic pig and wild boar are susceptible naturally.susceptible naturally.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
“Hog cholera, also known as swine fever,
is a disease native to America. It is highly
contagious and its prevalence led to the
first notice of an animal disease by the
federal government in 1860.”
http://www.lib.iastate.edu/spcl/manuscripts/MS389.htmlhttp://www.lib.iastate.edu/spcl/manuscripts/MS389.html
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Hog Cholera epidemic in Minnesota in 1913
http://www.extension.umn.edu/administrative/information/components/crisis01.html
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Classical Swine Fever - 2006Classical Swine Fever - 2006
1976 Last US outbreak1976 Last US outbreak
1978 US declared “Hog Cholera” free1978 US declared “Hog Cholera” free
http://www.colvet.es/infovet/may99/ganaderia.htm
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Breeding sows infected by low virulent Breeding sows infected by low virulent strains usually abort, strains usually abort,
……but may produce ‘late onset’ piglets that but may produce ‘late onset’ piglets that shed virus for 6-12 months before dying.shed virus for 6-12 months before dying.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine FeverClassical Swine Fever
……can survive for months can survive for months
in refrigerated meat in refrigerated meat
and for years and for years
in frozen meatin frozen meat
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Many ExpressionsMany Expressions
Occurs in acute, subacute, chronic, Occurs in acute, subacute, chronic, persistent (‘late onset’) or inapparent persistent (‘late onset’) or inapparent forms.forms.
Clinical forms closely match virulence of Clinical forms closely match virulence of the viral strain and susceptibility (age) of the viral strain and susceptibility (age) of the pig.the pig.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine FeverClassical Swine Fever
EtiologyEtiology
Host rangeHost range
Incubation Incubation
Clinical signsClinical signs
TransmissionTransmission
Diagnosis Diagnosis
Differential DiagnosisDifferential Diagnosis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
EtiologyEtiology
Only one serotypeOnly one serotype
Lipid enveloped virusLipid enveloped virus
Virus family Flaviviridae, Virus family Flaviviridae, Virus genus Virus genus PestivirusPestivirus
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Classical Swine Fever - 2006Classical Swine Fever - 2006
EtiologyEtiology
Related Pestiviruses: Related Pestiviruses:
– Bovine Viral Diarrhea (BVD) Bovine Viral Diarrhea (BVD)
– Border Disease Virus of Border Disease Virus of Sheep, Reindeer and GiraffeSheep, Reindeer and Giraffe
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Host RangeHost Range
Domestic swine and European wild boar Domestic swine and European wild boar are the only natural reservoir of are the only natural reservoir of
classical swine fever virusclassical swine fever virus
http://www.krykiet.com/polish_wildlife.htm
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Host RangeHost Range
Collared Peccary is Collared Peccary is only only mildly mildly susceptiblesusceptible..
aka Javelina
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Classical Swine Fever - 2006Classical Swine Fever - 2006
IncubationIncubation
3-4 days average, 3-15 days range 3-4 days average, 3-15 days range depending on strain, route and dosedepending on strain, route and dose
2-14 days (O.I.E.)2-14 days (O.I.E.)
The The Severe AcuteSevere Acute form: form:2-6 days incubation; death at 10-20 days 2-6 days incubation; death at 10-20 days post infection post infection
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Classical Swine Fever - 2006Classical Swine Fever - 2006
SyndromesSyndromes
VirulenceVirulence, immune status, age, breed, and , immune status, age, breed, and pregnancy figure in the clinical picture.pregnancy figure in the clinical picture.
Highly virulent strains: prevalent Highly virulent strains: prevalent decades ago - causes decades ago - causes Peracute and Peracute and Classic Acute diseaseClassic Acute disease
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Classical Swine Fever - 2006Classical Swine Fever - 2006
SyndromesSyndromes
Moderately virulent strains: Moderately virulent strains: prevalent today - causes prevalent today - causes Subacute Subacute Disease Disease
Low virulent strains: Low virulent strains:
prevalent today - causes prevalent today - causes Chronic Chronic DiseaseDisease and and Carrier Sow Carrier Sow Syndrome/Persistent InfectionSyndrome/Persistent Infection
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Classical Swine Fever - 2006Classical Swine Fever - 2006
SyndromesSyndromes
Seroconversion only after 2-3 weeksSeroconversion only after 2-3 weeks
– CSF virus is immunosuppressive like BVD CSF virus is immunosuppressive like BVD in cattlein cattle
Cellular tropism of virusCellular tropism of virus
– Endothelial, lymphoreticular, Endothelial, lymphoreticular, macrophages, some epithelialmacrophages, some epithelial
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Acute Disease Acute Disease (Classic Disease)(Classic Disease)
Mortality: approaches 100%.
Viral shedding: 10-20 days until antibodies
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Acute DiseaseAcute Disease
Clinical SignsClinical Signs
High Fever: 106-108High Fever: 106-108ooF (>41F (>41ooC)C)
DepressionDepression
ConjunctivitisConjunctivitis
Constipation, then DiarrheaConstipation, then Diarrhea
Skin hemorrhages/CyanosisSkin hemorrhages/Cyanosis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Acute DiseaseAcute Disease
Pile up for warmthPile up for warmth
Anorexic and gauntAnorexic and gaunt
Staggering gaitStaggering gait
ConvulsionsConvulsions
AbortionAbortion
Death 10-20 Death 10-20 days post infection days post infection
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Acute DiseaseAcute Disease
PathologyPathology– Severe tonsilitisSevere tonsilitis– Severe leukopeniaSevere leukopenia– Hemorrhagic swollen lymph nodesHemorrhagic swollen lymph nodes– Hemorrhages renal cortexHemorrhages renal cortex– Petechiation of the bladder, larynx, epiglottis, heart, Petechiation of the bladder, larynx, epiglottis, heart,
intestinal mucosa, skinintestinal mucosa, skin– Splenic infarctsSplenic infarcts– Necrotic gastroenteritisNecrotic gastroenteritis– EncephalitisEncephalitis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Subacute DiseaseSubacute Disease
Mortality: reduced
Viral shedding: until death.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Subacute DiseaseSubacute Disease
Clinical signs with subacute disease
are similar to acute disease,
but considerably less severe.
*As with Acute CSF, the disease is clinically and pathologically consistent with a generalized septicemia
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Subacute DiseaseSubacute Disease
Fever for 2-3 weeks Fever for 2-3 weeks
105-106105-106ooFF(>41(>41ooC)C)
Death within 30 days post Death within 30 days post infection infection
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Chronic DiseaseChronic Disease
Long term carriers of virus in tissues: lymph nodes, lung, spleen.
Mortality: High; Invariably die in 1-3 months
Viral Shedding: May shed virus for months
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Chronic DiseaseChronic DiseaseLow virulent strain or infection of vaccinated herd. Low virulent strain or infection of vaccinated herd.
Three clinical phases:Three clinical phases: Initial: resembles SubacuteInitial: resembles Subacute
–FeverFever–AnorexiaAnorexia–DepressionDepression–LeukopeniaLeukopenia
Second: improve, look ~normalSecond: improve, look ~normal
Final: ‘runts’ with ‘Initial’ Phase signs.Final: ‘runts’ with ‘Initial’ Phase signs.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
LesionsLesions
Button ulcers in cecum and Button ulcers in cecum and colon (caused by bacteria)colon (caused by bacteria)
Calcification rib cartilageCalcification rib cartilage
GlomerulonephritisGlomerulonephritis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
‘‘Carrier Sow Syndrome’Carrier Sow Syndrome’
Mortality: In pregnant sow disease goes Mortality: In pregnant sow disease goes unnoticed. Sow may shed virus for unnoticed. Sow may shed virus for months especially at farrowingmonths especially at farrowing
High Mortality: In piglets infected High Mortality: In piglets infected congenitally or post-natally. Piglets look congenitally or post-natally. Piglets look healthy at birth, shed virus for 6-12 month healthy at birth, shed virus for 6-12 month before dying before dying
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Classical Swine Fever - 2006Classical Swine Fever - 2006
‘‘Carrier Sow Syndrome’Carrier Sow Syndrome’ Clinical SignsClinical Signs
Clinical Signs in SowsClinical Signs in Sows
–Usually mild (fever) Usually mild (fever)
–or subclinical.or subclinical.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
‘‘Carrier Sow Syndrome’Carrier Sow Syndrome’ Clinical SignsClinical Signs
Clinical Signs in PigletsClinical Signs in Piglets– Stillbirths, deformities, Stillbirths, deformities,
mummies, mummies, – born dead, or congenital born dead, or congenital
tremors.tremors.– Some are born healthy: Some are born healthy: – become persistent become persistent
shedders to maintain CSF shedders to maintain CSF in breeding herd; in breeding herd;
– are immuno-tolerant but will are immuno-tolerant but will eventually die of ‘late onset’ eventually die of ‘late onset’ disease at 6-12 months of disease at 6-12 months of age.age.
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Congenital Form of CSFCongenital Form of CSF
Weak "Shaker" piglets Weak "Shaker" piglets
Persistently infected Persistently infected – Viremic - seronegative pigletsViremic - seronegative piglets
Life-long viremiaLife-long viremia
Will in time lead to complications and Will in time lead to complications and deathdeath
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Classical Swine FeverClassical Swine FeverClinical SignsClinical Signs
HOT, SICK PIGSHOT, SICK PIGS
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Classical Swine Fever - 2006Classical Swine Fever - 2006
HuddlingHuddling
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Neurological SignsNeurological Signs
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Clinical SignsClinical Signs
Constipation followed by diarrheaConstipation followed by diarrhea
Reproductive disordersReproductive disorders
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Clinical SignsClinical Signs
Physical exam to view tonsils
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Clinical SignsClinical Signs
Tonsillar Tonsillar
necrosisnecrosis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Tonsil Necrosis and Severe Tonsil Necrosis and Severe HemorrhageHemorrhage
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Tonsil Necrosis Tonsil Necrosis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
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Classical Swine Fever - 2006Classical Swine Fever - 2006
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Severe depressionSevere depression
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Skin hyperemia & hemorrhageSkin hyperemia & hemorrhage
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Classical Swine Fever - 2006Classical Swine Fever - 2006
ConjunctivitisConjunctivitis
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Classical Swine Fever - 2006Classical Swine Fever - 2006
ConjunctivitisConjunctivitis
European Wild Boar
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Classical Swine Fever - 2006Classical Swine Fever - 2006
High Mortality in PigletsHigh Mortality in Piglets
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Classical Swine Fever - 2006Classical Swine Fever - 2006
Lesions of CSF Lesions of CSF
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Mottled LNMottled LN
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Mottled Lymph NodeMottled Lymph Node
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Mottled Lymph NodesMottled Lymph Nodes
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Lymph node necrosisLymph node necrosis
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Splenic infarctsSplenic infarcts
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Spleen lesionsSpleen lesions
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SpleenSpleen
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SpleenSpleen
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Renal petechiationRenal petechiation
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Renal lesionsRenal lesions
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Renal lesionsRenal lesions
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Renal lesionsRenal lesions
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Chronic CSF: Chronic CSF: Button Ulcers in CecumButton Ulcers in Cecum
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TransmissionTransmission
The main source of infection is the PIG, The main source of infection is the PIG, either live animal contact or uncooked pig either live animal contact or uncooked pig productsproducts
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TransmissionTransmission
Mechanical transmission Mechanical transmission
Fomites very important Fomites very important
Veterinarians and farm Veterinarians and farm
workersworkers
Discarded infected pig meatDiscarded infected pig meat
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TransmissionTransmission
VERY CONTAGIOUSVERY CONTAGIOUS
Causes devastating epidemicsCauses devastating epidemics
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TransmissionTransmissionDirect TransmissionDirect Transmission– Contact between sick and healthy animals: all tissues, Contact between sick and healthy animals: all tissues,
excretions, secretions, semen and blood (oronasal).excretions, secretions, semen and blood (oronasal).
– Transplacental infection: Carrier Sow Syndrome.Transplacental infection: Carrier Sow Syndrome.
– Airborne spread to neighbors possible if high density pig farms.Airborne spread to neighbors possible if high density pig farms.
Indirect TransmissionIndirect Transmission– Feeding uncooked garbage with infected meat.Feeding uncooked garbage with infected meat.
– Fomites: vehicles, equipment, boots, clothes.Fomites: vehicles, equipment, boots, clothes.
How is CSFV often introduced into a new country? Garbage!
How does CSFV travel once established? Movement/Fomites
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Stability of CSF VirusStability of CSF Virus
Survives well in cool, moist & protein rich environmentsSurvives well in cool, moist & protein rich environments– E.g. Stored MeatE.g. Stored Meat
Can survive some forms of meat processingCan survive some forms of meat processing– Survives curing and smokingSurvives curing and smoking
Partially resistant to heat Partially resistant to heat – Readily killed by cookingReadily killed by cooking
Inactivated at pH < 3.0 or > 11.0Inactivated at pH < 3.0 or > 11.0
Susceptible to organic solvents (ether, chloroform)Susceptible to organic solvents (ether, chloroform)
Inactivated by most disinfectants: 1-2% NaOH suitableInactivated by most disinfectants: 1-2% NaOH suitable
Moderately Fragile
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Route of Infection of CSFRoute of Infection of CSF
Ingestion: e.g. contaminated swillIngestion: e.g. contaminated swill
Contact with the conjunctivaContact with the conjunctiva
Mucous membranesMucous membranes
Skin abrasionsSkin abrasions
InseminationInsemination– Contaminated semen caused 1967 outbreak Contaminated semen caused 1967 outbreak
in the Netherlandsin the Netherlands
All secretions and excretions are infectious
Oronasal Route
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Environmental Persistence:Environmental Persistence:Moderately FragileModerately Fragile
Sensitive to desiccation & UVSensitive to desiccation & UV
Stable at pH 3-11 Stable at pH 3-11
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Environmental Persistence:Environmental Persistence:Moderately FragileModerately Fragile
Survival in Pork ProductsSurvival in Pork Products
– Up to 85 days in chilled pork.Up to 85 days in chilled pork.
– >4 years in frozen pork.>4 years in frozen pork.
– 313 days in Parma hams and 140 -252 313 days in Parma hams and 140 -252
days in Serrano and Iberian hams.days in Serrano and Iberian hams.
– Readily killed by cooking e.g. 30 min Readily killed by cooking e.g. 30 min
6565ooC.C.
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Spanish Serrano Ham
Parma ham — prosciutto di Parma — is a type of Italian raw, salted and dried ham, produced in Parma region. It is one of the most famous varieties of cured hams.
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Environmental Persistence:Environmental Persistence:Moderately FragileModerately Fragile
Survival in environmentSurvival in environment
– Months in contaminated pig pens Months in contaminated pig pens
in temperate climates.in temperate climates.
– 15 days in liquid phase of manure 15 days in liquid phase of manure
slurry.slurry.
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Classical swine fever Classical swine fever 20042004
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Geographic DistributionGeographic Distribution
Distributed nearly worldwideDistributed nearly worldwide
Higher prevalenceHigher prevalence– East & Southeast Asia, India, China, East & Southeast Asia, India, China,
South and Central AmericaSouth and Central America
Africa???Africa???
Eradicated in:Eradicated in: – U.S.U.S.
– AustraliaAustralia
– New ZealandNew Zealand
– CanadaCanada
– Parts of EuropeParts of Europe Threat to Puerto Rico and U.SThreat to Puerto Rico and U.S..
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Disease Control MeasuresDisease Control Measures
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Immunity & Vaccines for CSFImmunity & Vaccines for CSFGood immunity post-Good immunity post-infectioninfectionMLV vaccines availableMLV vaccines available– Lapinized vaccinesLapinized vaccines– Cell culture vaccines Cell culture vaccines – Yearly dose (Safe in Yearly dose (Safe in
pregnant gilts)pregnant gilts)
Marker sub-unit vaccinesMarker sub-unit vaccines– DIVA strategyDIVA strategy
E2 Vaccine and EE2 Vaccine and Ernsrns ELISA ELISA
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DiagnosisDiagnosis
HistoryHistoryClinical signsClinical signsPost Mortem findingsPost Mortem findings– Hemorrhage in lymph nodes, kidneys, tonsils, etc.Hemorrhage in lymph nodes, kidneys, tonsils, etc.– Splenic infarcts: nearly pathognomonicSplenic infarcts: nearly pathognomonic
HistopathologyHistopathology– Degeneration and necrosis of endothelial cellsDegeneration and necrosis of endothelial cells– LN: lymphocytic depletion & reticular hyperplasiaLN: lymphocytic depletion & reticular hyperplasia
Laboratory testing: required for confirmationLaboratory testing: required for confirmation
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Laboratory Testing for CSFLaboratory Testing for CSFVirus isolationVirus isolation– In Swine Cell Cultures; Inoculation in Live Pigs to confirm.In Swine Cell Cultures; Inoculation in Live Pigs to confirm.
Antigen DetectionAntigen Detection– Direct Fluorescent Antibody Test (DFAT)Direct Fluorescent Antibody Test (DFAT)– Monoclonal antibody-Avidin Biotin Complex (ABC)Monoclonal antibody-Avidin Biotin Complex (ABC)
Nucleic Acid DetectionNucleic Acid Detection– Polymerase Chain Reaction (PCR) – Conventional & Polymerase Chain Reaction (PCR) – Conventional &
Real-timeReal-time
Antibody DetectionAntibody Detection– ELISA ELISA – Immunoperoxidase Test (IPT)Immunoperoxidase Test (IPT)– Virus Neutralization TestVirus Neutralization Test
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Direct FA test for Direct FA test for Classical Swine FeverClassical Swine Fever
Nonspecific staining of cryptin non-infected tonsil
Crypt of CSF-infected tonsil
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ABC Immunoperoxidase Test for ABC Immunoperoxidase Test for Classical Swine FeverClassical Swine Fever
Cytoplasmic staining in tonsil of CSF-infected pig
No staining in tonsil of negative control
pig
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Differential DiagnosisDifferential Diagnosis
African Swine FeverAfrican Swine Fever
PasteurellaPasteurella
HaemophilusHaemophilus
Salmonellosis (septicemic)Salmonellosis (septicemic)
ErysipelasErysipelas
EperythrozoonosisEperythrozoonosis
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Differential DiagnosisDifferential Diagnosis
Poisoning, e.g. Coumarin Poisoning, e.g. Coumarin (hemorrhage), Salt (CNS)(hemorrhage), Salt (CNS)Pseudorabies virus (PRV)Pseudorabies virus (PRV)Porcine Reproductive and Respiratory Porcine Reproductive and Respiratory Syndrome (PRRS)Syndrome (PRRS)Porcine Dermatitis and Nephropathy Porcine Dermatitis and Nephropathy Syndrome (PDNS)Syndrome (PDNS)Post-weaning Multisystemic Wasting Post-weaning Multisystemic Wasting Syndrome (PMWSSyndrome (PMWS))
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Image WatermarksImage Watermarks
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Online ReferencesOnline References
OIE Technical Cards (2005): OIE Technical Cards (2005): www.oie.int/eng/maladies/en_fiches.htmwww.oie.int/eng/maladies/en_fiches.htm
Center for Food Security and Public Health Center for Food Security and Public Health (2004): (2004): www.cfsph.iastate.eduwww.cfsph.iastate.edu
USAHA Foreign Animal Diseases book (1998): USAHA Foreign Animal Diseases book (1998): www.vet.uga.edu/vpp/gray_book/www.vet.uga.edu/vpp/gray_book/
The Merck Veterinary Manual, 8The Merck Veterinary Manual, 8thth ed., 1998, ed., 1998,
Online (2003): Online (2003): www.merckvetmanual.comwww.merckvetmanual.com
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AcknowledgementsAcknowledgements
Corrie Brown, DVM PhD. University of Corrie Brown, DVM PhD. University of Georgia, CVMGeorgia, CVM
William H. White, BVSc, MPH, Senior Staff William H. White, BVSc, MPH, Senior Staff Veterinarian, USDA, APHIS, PIADCVeterinarian, USDA, APHIS, PIADC
Robin Sewell, DVM, LibrarianRobin Sewell, DVM, Librarian
Kelsey Pohler- Research Assistant Kelsey Pohler- Research Assistant
Tita Burnham – Student AssistantTita Burnham – Student Assistant