PET OWNER VERSION

Lassa Fever

Full Review: Oct 2026 ByNatalie Antinoff, DVM, DABVP (Avian Practice), Texas Avian & Exotic Hospital | Peer reviewed byLaurie Hess, DVM, DABVP, The MSD Veterinary Manual
Last updated: Oct 2026
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Lassa fever is caused by a virus that is carried by rats and can spread to people. Rats don't become sick but spread the virus through their feces, urine, or saliva. Lassa virus is found only in West Africa.

Symptoms of Lassa Fever in Animals

Several types of rats are carriers of the Lassa virus, but they don't get sick.

Prevention of Lassa Fever

  • Avoid contact with rodents in countries where Lassa virus occurs.

  • Don't leave food or trash around and keep living areas clean and pest-free.

Important Zoonotic Points Regarding Lassa Fever

  • Lassa virus is a disease spread by rats in West Africa.

  • People can spread the disease to other people.

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