Symptoms of Yellow Fever usually take 3–6 days to develop and include fever, chills, headache, backache, and muscle aches. About 15% of people who get yellow fever develop serious illness that can lead to bleeding, shock, organ failure, and sometimes death.

Yellow Fever Key Facts:

Symptoms of Yellow Fever

Yellow fever develops quickly, with symptoms occurring three to six days after exposure. The initial symptoms of the infection are similar to those of the influenza virus. They include:

Acute Phase

This phase usually lasts for three to four days. Common symptoms include:

After the acute phase is over, symptoms will begin to go away. Many people recover from yellow fever at this stage, but some people will develop a more serious version of this condition.

Toxic Phase

The symptoms that you experienced in the acute phase may disappear for up to 24 hours. Then, those symptoms will return, along with new and more serious symptoms. These include:

This phase of the disease is often fatal, but only 15 percent of people with yellow fever enter this phase.


There’s no cure for yellow fever. Treatment involves managing symptoms and assisting your immune system in fighting off the infection by: