General information, not a diagnosis Method and limitations

Fact sheetVirus

Lassa fever

Lassa fever is a viral infection mainly related to food or objects contaminated with urine or rodents' dejections in West Africa.

Documentary Enrichment: · General information

Essentials

Hemorrhagic fever endemic in several West African countries, linked to rodents and sometimes transmitted between humans.

Agent
Mammarenavirus of Lassa
Transmission or exposure
Animal/zoonosis · Close contact

Situation and vulnerability

Pregnancy, particularly advanced, is subject to serious complications. Interpersonal transmissions may occur during contact with biological fluids, especially during treatment.

Signs and limits of their interpretation

Many infections are not symptomatic. Progressive fever, weakness and pain may evolve into serious harm; hearing loss may persist after healing.

Diagnosis and monitoring

The confirmation involves specialized tests such as RT-PCR or antibody detection. Symptoms alone do not distinguish Lassa from malaria and other fevers.

Official sources consulted on . Documentary summary, without medical rereading.

Check these benchmarks in the WHO reference →

Prevention and care

Protect the food from rodents and maintain a good hygiene of housing. After a compatible exposure and fever, seek medical guidance quickly and specify the stay.

Practical issues

Is ribavirin a treatment with certain efficacy?

WHO highlights uncertainties about its effectiveness and how it is used. Early support care remains important; no treatment should be undertaken on this sheet.

Preparing for an exchange with a professional

  • Stay and exposure to rodents
  • Possible pregnancy and term
  • Fever, evolution and hearing disorders

Bring the full minutes and dates. This information facilitates evaluation; its collection must not delay an urgent appeal.

Individual decisionThe choice of a test, treatment or prevention depends on the local situation and recommendations. In case of distress, call 911.
A clean handwashing station, soap dispenser and clean towels, no people. AI-generated illustration.
Prevention illustration — Fièvre de Lassa — A clean handwashing station, soap dispenser and clean towels, no people.
Image generated by artificial intelligence. AI illustration; it does not depict a disease, biological agent or diagnosis.

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Related fact sheets

These sheets share ways or contexts of exhibition in our catalogue. This reconciliation does not establish a differential diagnosis.

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Further reading

These publications help you verify the concepts discussed. Disease records and directory entries each identify their sources.

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