1、The incubation period of Lassa fever ranges from 6-21 days.
拉沙熱的潛伏期為6 - 21天。

2、Lassa fever is endemic to West Africa, the virus kills thousands of people each year.
熱在西非流行，該病毒每年可殺死成千上萬(wàn)的人。

3、Lassa fever occurs in all age groups and in both men and women.
拉沙熱發(fā)生在所有年齡組的男女中間。