congenital tremor syndrome

A benign, congenital disease of piglets manifested by severe muscle tremor, especially when standing, and absent when asleep. There is no muscle weakness, the only deaths are due to crushing due to impairment of evasive actions. Causes include: transplacental classical swine fever (hog cholera) virus infection, fetal infection with pseudorabies virus, Japanese B encephalitis virus, possibly fetal porcine circovirus 2 infection, inherited sex-linked recessive gene in Landrace, inherited autosomal recessive gene in Wessex Saddleback, exposure of sow to trichlorfon (Teguvon) 45–79 days of pregnancy. The histological proof is a dysmyelinogenesis. Called also myoclonia congenita, trembles.