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
Latest articles
Microalgae potential to mop up waste in meat processing
Why monitor swine herds for PCV2?
Water acidification to improve piglet health and performance – 5 takeaways

Content: there are also other causes of shaking or trembling piglets). If the virus crosses the placenta before the piglets' immune systems have developed they may be born apparently healthy although possibly weak and may grow on to be persistent carriers without at first showing clinical signs. They shed virus so they are a menace to other pigs. At several weeks or months of age they may develop typical clinical signs but these are likely to be milder, last longer and without the high temperatures. Virus that infects the piglets in the uterus may cause other effects, namely, death, mummification, abortion or the birth of weak piglets some of which may be deformed. 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.