Changes

==Diagnosis==

==Diagnosis==

===Clinical Signs===

===Clinical Signs===

 

et al., 2000). The incubation period in individual

Although the incubation period for classical swine fever is generally less than ten days, in the field it may take up to four weeks for clinical signs to become apparent in a population. Disease severity varies with virulence, immune status and the age of the animal: this means that although acute, chronic and congenital forms of the disease can be appreciated, there is no "classic" disease presentation.

animals is about one week to 10 days. Under field

 

conditions, symptoms may only become evident in a

In the acute form, animals are almost always pyrexic. In piglets under 12 weeks old the fever may exceed 40°, but in adults

 

later (Laevens et al., 1999). The severity of clinical

the virulence of the virus, and in older breeding pigs

et al., 2000), as the same CSF virus isolate can cause

different forms of CSF depending on age, breed and

immune status of the host animal (Floegel-Niesmann

Acute, chronic and prenatal forms of CSF can be

distinguished, and there is no array of classical

symptoms that is invariably associated with the disease.

Piglets up to 12 weeks of age most often display

Piglets up to 12 weeks of age most often display

the acute form. A constant finding is pyrexia, usually

the acute form. A constant finding is pyrexia, usually