2. 它由什麼所引起？
一隻小小的蟎是裸眼不可見的。其雌蟲為了產卵在皮膚內打洞，由此導致皮膚瘙癢等刺激症狀。

3. 它如何傳播？
導致疥瘡的蟎能夠通過性接觸和其他密切接觸從一個人傳播到另一個人；其次通過污染的衣服或床單，它也能傳播。疥瘡是一種擁擠環境居住的人的主要疾病。因而，傳播並不必定是性接觸這一種途徑。

1. What is it?
A mite infestation which causes persistent itching of the skin.

2. What causes it?
A tiny mite not visible to the naked eye. The female burrows through the skin to lay her eggs, thus causing skin irritation.

3. How is it transmitted?
The mite causing scabies can be transferred from one person to another by sexual and other close physical contact, less likely through infested clothing or bed linen. Scabies is mainly a disease of people living together in cramped quarters.Thus, the transmission is not necessarily a sexual one.