Title: Classical swine fever (Hog cholera) | The Pig Site
Headings: Classical swine fever (Hog cholera)
Classical swine fever (Hog cholera)
Background and history
Clinical signs
Acute disease
Sub-acute disease
Chronic and aberrant disease and persistent infection
Diagnosis
Post-mortem
Causes
Prevention
Vaccination
National eradication programmes
National preventative programmes
On-farm precautions
Treatment
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Content: Vaccination of sows during pregnancy with some of the original attenuated virus vaccines resulted in trans-placental infection of unborn piglets with similar adverse results. The newer attenuated vaccines are claimed to be safer. Low virulence strains of the virus may also multiply in the reproductive tracts of unvaccinated boars or boars which have been inadequately vaccinated. The vaccine virus itself in some of the older attenuated vaccines was thought to do this, resulting in returns to service and abortions. Diagnosis
In acute or sub-acute outbreaks a presumptive diagnosis can be made on the typical clinical signs and post-mortem lesions but African swine fever and Salmonella choleraesuis infection produce some similar signs and lesions. Salmonella choleraesuis is frequently a concurrent pathological infection with CSF virus, triggered off from its latent state by the CSF virus infection. In chronic or aberrant cases the clinical signs and lesions are less diagnostic and may only raise a suspicion of CSF. In all suspected cases laboratory tests should be done to confirm the diagnosis. Investigations are usually carried out by the authorities. It is best to send whole dead pigs to the diagnostic laboratory so the pathologists can sample what they want.