Difference between revisions of "African Swine Fever"
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=Epidemiology= | =Epidemiology= | ||
| − | + | The virus can persist on infected premises for months. Subacute recovered pigs become antibody-positive carriers. | |
| − | + | * Viral transfer occurs as follows: | |
| − | * | ||
**Africa: vertical transfer between '''soft ticks''' | **Africa: vertical transfer between '''soft ticks''' | ||
**Europe/Africa: '''direct contact''' with carrier pigs, '''aerosol''', infected swill, etc. | **Europe/Africa: '''direct contact''' with carrier pigs, '''aerosol''', infected swill, etc. | ||
Revision as of 17:40, 18 October 2010
Introduction
African Swine Fever ocurs after infection by the Asfarviridae family of viruses. ASF is a serious exotic virus that should not be confused with Classical Swine Fever.
Clinical Signs
Acute Virus (Africa)
- Nasal discharge, diarrhoea, reddening of the skin
- Death within 7 days
- PM: widespread internal hemorrhage
Subacute Virus (Europe)
- Mortality: 30-70%
- Survivors may lose body condition, have skin ulcers and joint swelling
- PM: Petechial hemorrhages may be seen under kidney capsule
Epidemiology
The virus can persist on infected premises for months. Subacute recovered pigs become antibody-positive carriers.
- Viral transfer occurs as follows:
- Africa: vertical transfer between soft ticks
- Europe/Africa: direct contact with carrier pigs, aerosol, infected swill, etc.
Diagnosis
- Mortalities with widespread hemorrhage, particularly in lymph nodes
- Test to distinguish from Classical Swine Fever and Porcine Circoviruses
- Immunofluorescence
- PCR
Control
- No vaccine is available
Prevention:
- Boiling swill
- Isolation of sick pigs, domestic pigs from wild pigs
- Keep pigs on concrete, not soil (to lessen tick contact)