42.仔豬的先天性舞蹈症，肌肉呈現：
(A)進行持續性收縮而不能鬆弛
(B)強直與鬆弛交替出現
(C)無力狀態
(D)鬆弛性麻痺

一直縮起來怎麼跳舞XD

先天性震顫，又稱myoclonia congenita先天性舞蹈症,” “trembling pig syndrome,” or “jumpy pig disease,”

中樞沒炎症反應、有些豬有Hypomyelination and dysmyelination，但跟臨床症狀嚴重程度無關

可能跟胎兒感染CSF、遺傳疾病、metrifonate/trichlorfon中毒有關
 

Congenital tremor

Congenital tremor (CT), also known as “myoclonia congenita,” “trembling pig syndrome,” or “jumpy pig disease,” is a disease of newborn pigs that is characterized by bilateral clonic contractions of skeletal muscle that cease when piglets are at rest (Done 1968). 

Gross examination and histopathology of affected piglets is unremarkable, with an absence of inflammation in the
CNS. Hypomyelination and dysmyelination have been described in some affected piglets, but lesions are subtle and not consistent and often do not correlate with the severity of clinical signs.

Historically, clinical signs of CT occurred with fetal infections with classical swine fever virus (CSF) (Harding
et al. 1966), inherited disorders (Harding et al. 1973; Patterson et al. 1973), and metrifonate/trichlorfon toxicity (Knox et al. 1978). 

Disease of swine, 11ed, p. 349