The reservoir, or host, of Lassa virus is a rodent known as the “multimammate rat” (Mastomys natalensis). Once infected, this rodent is able to excrete virus in urine for an extended time period, maybe for the rest of its life.

How do rats get Lassa virus?

People can contract Lassa virus from direct contact with the African soft-furred rat (Mastomys natalensis) — such as by eating them. And infected rodents can indirectly transmit the virus by salivating or urinating on rice, cassava and other crops stored in barrels or left to dry in the sun.

Can mice cause Lassa fever?

Lassa virus is typically transmitted via contact with infected rodents (Mastomys natalensis), either through consuming the animals or being exposed to their saliva or urine.