Yellow Fever


Yellow fever is a disease carried by female mosquitoes.


Yellow fever is caused by specific viruses transmitted by bites from infected mosquitoes.
Mosquito Bite
Mosquito bite
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Risk Factors

Factors that may increase your chances of getting yellow fever include:
  • Living, working, or traveling to areas with yellow fever
  • Failure to take proper precautions, such as vaccination or using mosquito protection


Yellow fever symptoms appear within a week after a person is bitten by an infected mosquito. Typically, acute phase symptoms will persist for 3-4 days, and then disappear. A small percentage of people progress into the toxic phase. The toxic phase symptoms begin within 24 hours of the end of the acute phase. Recovery from yellow fever provides lifetime immunity from the disease.Acute phase symptoms may include:
  • Fever
  • Headache
  • Muscle pain
  • Backache
  • Chills
  • Loss of appetite
  • Nausea and/or vomiting
Toxic phase symptoms may include:
  • High fever
  • Abdominal pain
  • Bleeding from the gums, nose, eyes, and/or stomach
  • Vomit that appears black due to blood content
  • Yellowing of the skin—jaundice
  • Confusion
  • Seizure
  • Coma


You will be asked about your symptoms and medical and travel history. A physical exam will be done. Blood tests will be needed for diagnosis. Antibodies for the virus may be detected in the blood.


Currently, medications or treatments specifically for yellow fever are not available. However, there are treatments that that can be given at a hospital to ease some symptoms of yellow fever.


It is important to keep the body hydrated. Fluids containing electrolytes may be given orally or may be injected through a vein to prevent dehydration.

Fever Reduction Methods

Anti-fever medications may be given to reduce fever.

Kidney Dialysis

In toxic phases, dialysis may be needed to help the kidneys filter waste.
Dialysis Mechanism
Dialysis pump
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Blood Transfusion

In toxic phase cases, a transfusion may be needed to replace blood cells and clotting agents lost through bleeding.

Antibiotics for Secondary Infections

Fighting yellow fever may cause the immune system to become temporarily weak. A weak immune system cannot guard against bacterial infections as it normally would, so infections occur more easily. Antibiotics may be given to fight bacterial infections if they occur. Antibiotics cannot be given to treat yellow fever because yellow fever is a virus, and viruses do not respond to antibiotics.

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