英语语法分析

The incubation period of Lassa fever ranges from 6-21 days.

拉沙热的潜伏期为6 - 21天。

Lassa fever occurs in all age groups and in both men and women.

拉沙热发生在所有年龄组的男女中间。

Humans usually become infected with Lassa virus from exposure to excreta of infected Mastomys.

人类通常通过暴露于受感染的Mastomys鼠的排泄物感染拉沙病毒。