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- Yellow fever facts
- What is yellow fever? What is the history of yellow fever?
- What causes yellow fever?
- How is yellow fever transmitted?
- What areas are high risk for contracting yellow fever?
- What is the incubation period for yellow fever?
- Is yellow fever contagious? How long is the contagious period for yellow fever?
- What are yellow fever symptoms and signs?
- How is yellow fever diagnosed?
- What is the treatment for yellow fever?
- How long does yellow fever last?
- What is the prognosis for people with yellow fever?
- Is it possible to prevent yellow fever?
- What are the side effects of the yellow fever vaccine?
- Where can people get more information on yellow fever?
Quick GuideTravel Health: Vaccines & Preventing Diseases Abroad
What is the incubation period for yellow fever?
The period of time from contracting the infection to the development of symptoms (incubation period) is generally between three to six days.
Is yellow fever contagious? How long is the contagious period for yellow fever?
Yellow fever is transmitted to humans by the bite of infected mosquitoes. Yellow fever is not contracted by direct contact with other individuals who are infected. Humans with yellow fever are infectious and can transmit the virus to uninfected mosquitoes shortly before the onset of fever and for three to five days after the onset of symptoms.
What are yellow fever symptoms and signs?
After infection with the yellow fever virus, many individuals will experience no clinically apparent manifestations of the disease (asymptomatic), while others will go on to develop a mild, self-limiting flu-like illness characterized by the following symptoms and signs:
Most patients with this initial acute phase of the disease improve after approximately three to four days. However, 15% of patients may enter a second phase of the disease which typically appears after a short remission of symptoms (about 24 hours) from the initial phase of the illness. This toxic phase of the disease is more severe, at which time the high fever returns and more organ systems become involved. In addition to the above symptoms, the following symptoms and signs may also develop:
- Abdominal pain
- Bleeding from the gums, nose, eyes, and/or stomach
- Blood in the stool (black stool) and blood in the vomit (black vomit)
- Easy bruising of the skin
- Kidney failure