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Observium › Yellow fever

Yellow fever Yellow fever virus

Yellow fever is a viral disease of typically short duration. In most cases, symptoms include fever, chills, loss of appetite, nausea, muscle pains—particularly in the back—and headaches. Symptoms typically improve within five days. In about 15% of people, within a day of improving the fever recurs, abdominal pain occurs and liver damage begins, causing yellow skin. If this occurs, the risk of bleeding and kidney problems is increased.

106WHO outbreaks
23,167Cases reported
8015Deaths
10Countries affected

Countries with active outbreaks

  • Brazil — 13 events, 2,728 cases, 1104 deaths
  • Nigeria — 12 events, 2,523 cases, 246 deaths
  • Democratic Republic of the Congo — 8 events, 3,032 cases, 752 deaths
  • Uganda — 8 events, 739 cases, 140 deaths
  • Republic of the Congo — 6 events, 2,449 cases, 623 deaths
  • Angola — 5 events, 2,081 cases, 649 deaths
  • Cameroon — 4 events, 555 cases, 106 deaths
  • Ghana — 4 events, 561 cases, 141 deaths
  • Kenya — 4 events, 1,585 cases, 278 deaths
  • France — 4 events, 757 cases, 391 deaths

Recent events

  • 2025-05-16T18:00:00Z · Ecuador — Yellow fever - Region of the Americas · 110 cases · 85 deaths
  • 2025-05-16T18:00:00Z · Colombia — Yellow fever - Region of the Americas · 110 cases · 85 deaths
  • 2025-05-16T18:00:00Z · Peru — Yellow fever - Region of the Americas · 110 cases · 85 deaths
  • 2025-05-16T18:00:00Z · Bolivia — Yellow fever - Region of the Americas · 110 cases · 85 deaths
  • 2025-05-16T18:00:00Z · Brazil — Yellow fever - Region of the Americas · 110 cases · 85 deaths
  • 2024-03-20T19:00:00Z · Cameroon — Yellow fever – African Region (AFRO) · 64 cases
  • 2024-03-20T19:00:00Z · Republic of the Congo — Yellow fever – African Region (AFRO) · 64 cases
  • 2024-03-20T19:00:00Z · Democratic Republic of the Congo — Yellow fever – African Region (AFRO) · 64 cases

Frequently asked questions

What is Yellow fever?

Yellow fever is an infectious disease caused by Yellow fever virus. Yellow fever is a viral disease of typically short duration. In most cases, symptoms include fever, chills, loss of appetite, nausea, muscle pains—particularly in the back—and headaches. Symptoms typically improve within five days. In about 15% of people, within a day of improving the fever recurs, abdominal pain occurs and liver damage begins, causing yellow skin. If this occurs, the risk of blee

How is Yellow fever transmitted?

The main transmission routes of Yellow fever are: mosquito-borne (Aedes, Haemagogus).

Where is Yellow fever endemic?

Yellow fever is endemic in the following regions: Sub-Saharan Africa, South America.

What is the case fatality rate of Yellow fever?

The typical case fatality rate (CFR) of Yellow fever is 20–50%.

How many active Yellow fever outbreaks worldwide?

Currently 106 active WHO outbreaks reported, with 23167 cases and 8015 deaths in the surveillance window.

Official sources

Observium aggregates real-time data from authoritative sources: WHO Disease Outbreak News, CDC NNDSS, ECDC, Europe PMC, Italian Ministry of Health, ISS, UKHSA, RIVM, RKI, BAG, ISCIII, NICD, and 20+ national sources plus Google News.

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