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。
2
Mastomys infected with Lassa virus do not become ill, but they can shed the virus in their excreta (urine and faeces).
感染拉沙病毒的Mastomys 鼠并不发病，但它们可将病毒排放到其排泄物（尿和粪便）中。
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Persons at greatest risk are those living in rural areas where Mastomys are usually found, especially in areas of poor sanitation or crowded living conditions.