Table 1.

Etiology of congenital tremor types in piglets.

	Congenital tremor type
	A-I	A-II	A-III	A-IV	A-V
Etiology	Classical swine fever virus	Atypical porcine pestivirus	Genetic sex-linked recessive	Genetic autosomal recessive	Chemical trichlorfon
Breed	All	All	Landrace	Saddleback	All
Affected litters	High	High in gilts Low in sows	Low	Low	High
Mortality of CT-piglets	Moderate-high	Low-moderate	High	High	High