2. 它由什麼所引起？
滴蟲病由被稱為陰道滴蟲（trichomonas vaginalis）的單細胞原生寄生蟲所引起。它用其可動的鞭毛樣的尾向前驅動，在溫暖、潮濕環境孳生，尤其在陰道更易生存，但是，也在男性的尿道內寄生。

3. 它如何傳播？
滴蟲病通常在陰道性交中被傳染：女性能傳染男性，反之亦然。如果兩個女性的性器官非常靠近，女性感染者也能傳染另外的女性。最後，假若找到了潮濕、溫暖的地方，陰道滴蟲能夠在人體外生存數小時，所以，在罕見的病例中，能夠從座便器、衣服或濕毛巾上沾染上害蟲。

1. What is it?
Trichomoniasis is common infection that is usually transmitted by sexual contact, but it is not impossible to get it also from toilet seats, wet towels, and clothes.

2. What causes it?
Trichomoniasis is caused by the single-celled protozoan parasite called trichomonas vaginalis. It uses its whip-like tail to move and propel itself forward, and it thrives in warm and moist environments, especially inside the vagina, but also inside the urethra in males.

3. How is it transmitted?
Trichomoniasis is usually transmitted during vaginal intercourse: Females can infect males and vice versa. Females can also infect other females if their sex organs come into very close contact. Finally, since the trichomoniasis parasite can survive for a few hours outside the human body if it finds a moist and warm place, it may, in rare cases, be picked up from toilet seats, clothes or wet towels.