an introduction to peste des petits ruminants
TRANSCRIPT
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An Introduction to Peste des Petits
Ruminants
dR Kedar Karki
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Peste des Petits Ruminants Pest of Small Ruminants, Pest of
Sheep and Goats, Stomatitis-Pneumoenteritis Complex
or Syndrome, Pseudorinderpest of Small
Ruminants, Kata, Goat Plague, contagious Pustular Stomatitis
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Overview Organism
Economic impact
Epidemiology
Transmission
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Overview
Clinical signs
Diagnosis and treatment
Prevention and control
Actions to take
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The Organism Family Paramyxoviridae
Genus Morbillivirus
Similar to Rinderpest
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Other members of the family include
Measles virus
Canine distemper virus
Phocid distemper virus of sea mammals
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History 1942: : Cote d’Ivoire in West Africa
Soon spread to Nigeria, Senegal and Ghana
1972: Sudan
1990’s: Re-emerging as a result of decreases in
veterinary services
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Economic Impact Presence of disease can limit Trade and
export
Import of new breeds
Development of intensive livestock production
Loss of animal protein for human consumption
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Epidemiology /Susceptible Species
Principally goats and sheep
One report in captive wild ungulates
American white tail deer experimentally susceptible
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Susceptible Species Role of wildlife in transmission
unknown
Cattle and pigs seroconvert but do not transmit disease
High mortality in Indian buffalo in 1977
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Probable global distribution
of PPR virus infection
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Geographic Distribution Africa, between the Sahara and the
equator
The Middle East
Arabian Peninsula, Israel, Syria, Iraq,Jordan
Indian subcontinent Nepal.
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Morbidity/Mortality Morbidity 80-90%
Mortality 50-80%, can be up to 100%
More severe in young animals, poor nutrition, concurrent parasitic infections
Goats more susceptible than sheep
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Transmission /Animal Transmission Close contact
Virus present in ocular, nasal and oral secretions and feces
No known carrier state
Unknown if fomites play a role
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Human Transmission
The Pestes des Petit ruminants virus does not infect humans
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Disease in Animals/Clinical Signs Incubation period 3 to 10 days
Acute fever and anorexia
Upper respiratory discharge progressing
to catarrhal exudate
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PPR - Dried exudate on the muzzle and around the eye resulting from rhinitis and conjunctivitis.
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PPR - Necrosis (whitish areas) of the epithelium on the tongue and pharynx.
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diarrhea often watery and dark green (almost black) in color.
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Loss of condition and rough hair coat
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Loss of condition and rough hair coat
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PPR in a goat: purulent eye and nose discharges
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PPR in a goat: inflamed (reddened) eye membranes
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PPR in a goat: later mouth lesions
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PPR in a goat: early mouth lesions showing areas of dead cells
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PPR in a goat: swollen, eroded lips
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PPR in a goat: signs of diarrhoea
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PPR in a goat: nodular lesions around the mouth
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PPR in a goat: "zebra striping" in the large intestine
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Clinical Signs
Profuse diarrhea, dehydration, emaciation, dyspnea and death in 5-10 days
Bronchopneumonia, abortion
Prognosis correlated with extent of mouth lesions
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Post Mortem Lesions Inflammatory and necrotic lesions
Oral cavity
Throughout gi tract Emaciation
“Zebra stripe” lesions of congestion in large intestine
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Post Mortem Lesions
Bronchopneumonia and other respiratory lesions
Enlarged lymph nodes
Lesions similar to Rinderpest
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Sampling•
Before collecting or sending any samples, the proper authorities should be contacted
Samples should only be sent under secure conditions and to authorized laboratories to prevent the spread of the disease
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Clinical Diagnosis Clinical
PPR should be considered in any acutely febrile, highly contagious disease with oral erosions and GI signs
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Differential Diagnosis Rinderpest
Contagious caprine pleuropneumonia
Bluetongue
Pasteurellosis
Contagious ecthyma
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Differential Diagnosis Foot and mouth disease
Heart water
Coccidiosis
Nairobi sheep disease
Mineral poisoning
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Diagnosis Laboratory Tests
Wide variety are used for detecting virus, viral antigen, viral nucleic acid and antibody
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Diagnosis/Samples
Swabs of conjunctival, nasal, buccal and
rectal discharges
Whole blood collected on heparin Lymph nodes, especially mesenteric and bronchial nodes
Spleen
Large intestine and lungs
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Samples
Transport under refrigeration
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Treatment No specific treatment
Drugs to control bacterial and parasitic complications may decrease mortality
Supportive care
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Prevention and Control Recommended Actions Notification of Authorities
Area Veterinarian in Charge (AVIC) State veterinarian Quarantine
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Disinfection virus killed by most common disinfectants
Phenols
Sodium hydroxide 2% for 24 hours
Ether
Detergents
Virus survives for long periods in chilled or frozen tissues
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Vaccination Rinderpest vaccine used in Africa
effective for 12 months against PPR
Vaccination hinders ongoing efforts at Rinderpest eradication
Homologous attenuated PPR vaccine is being tested and may soon be commercially available
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Control and Eradication Affected area should be quarantined
Infected animals slaughtered
Carcasses burned or buried
Proper disposal of contact fomites, decontamination
Import restriction