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==Diagnosis==
 
==Diagnosis==
 
===Clinical Signs===
 
===Clinical Signs===
The main route of infection in field cases is oronasal
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by direct or indirect contact with infected pigs or by
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feed which is contaminated with virus, e.g., swill. In
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areas with a high density of pigs, virus spread easily
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occurs between neighbouring pig holdings (Fritzemeierj
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et al., 2000). Disease transmission via the
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semen of infected boars may also occur (Floegel
   
et al., 2000). The incubation period in individual
 
et al., 2000). The incubation period in individual
 
animals is about one week to 10 days. Under field
 
animals is about one week to 10 days. Under field
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