像头痛、背痛和其他疼痛、头晕、肌肉抽搐、痉挛性震颤等，都是完全健康者也可能发生的。
Headaches, backache and other pains, light-headedness, jerks and tremors all occur in totally healthy persons.
肌肉痉挛和抽搐使他们中三分之一的人无法进行打开瓶盖、自行穿衣或走出车厢之类的简单活动。
Muscle cramps and spasms prevent about a third of them from performing simple tasks such as unscrewing a lid, getting dressed or climbing out of a car.
许多猪没有症状，但另一些则出现急性发热病症，呼吸困难和神经症状，如颤抖，抽搐和肌肉痉挛等。
Many pigs had no symptoms, but others developed acute feverish illness, laboured breathing, and neurological symptoms such as trembling, twitching and muscle spasms.
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