AFRICAN SWINE FEVER TUTORIAL APPEARANCE OF THE DISEASE IN A HERD The first appearance of ASF in a country or area is usually characterized by high mortality after a short febrile illness. Pigs become depressed, stop eating, huddle together and, in the peracute form, may die before other clinial signs develop. A swaying gait, recumbency, difficult breathing and flushing of the skin, particularly over the abdomen and extremities in white-skinned pigs, commonly develop in pigs that survive for more than a day. The appearance of ASF in herds is usually associated with one of the following events: close contact between domestic pigs and warthogs that may be harbouring infected tampans; introduction of new pigs into a herd, for example through purchase, for ceremonies or boar loan; introduction of infected pig meat from neighbouring villages; feeding of swill to pigs that contains raw or insufficiently cooked pork and pig remnants or access to such remnants through scavenging; movement of vehicles and people between herds during an outbreak.
Posted on: Wed, 12 Mar 2014 11:04:35 +0000
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