Yellow fever - including symptoms, treatment and prevention
Yellow fever is an infection in humans caused by the yellow fever virus. Yellow fever occurs in tropical areas of Africa and Central and South America. Infections have increased in recent years as humans are in greater contact with infected mosquitoes.
Yellow fever does not naturally occur in Australia but the mosquitoes capable of transmitting the virus are present in North Queensland so there is the potential for local transmission from returned travellers who are infected. Strict quarantine measures are in place at Australia’s border to ensure that this does not occur.
The ‘yellow’ in the name refers to the skin colour that occurs when the infection involves the liver.
Yellow fever is a notifiable condition1
How yellow fever is spread
In rainforest areas of Africa and Central and South America yellow fever is transmitted between mainly non-human primates and several species of mosquitoes of the genus Haemagogus. Occasional human infection occurs in people who are working or living in these areas.
Large numbers of cases (epidemics) can also occur in urban areas when a human with yellow fever infects the local Aedes mosquitoes (mainly Aedes aegypti) resulting in transmission from human to human via infected mosquitoes.
Signs and symptoms of yellow fever
A first phase of symptoms is characterised by flu-like symptoms including:
nausea and vomiting
loss of appetite.
Most people improve after 3 to 4 days but 15% of people then enter into a second more toxic phase with liver and kidney failure. Of these severe cases around 50% are fatal. Symptoms in the second phase may include:
return of high fevers
abdominal and back pain
nausea and vomiting
drowsiness (excessive sleepiness) and weakness
yellow skin or eyes (jaundice) (see image)
Diagnosis of yellow fever
Yellow fever can be diagnosed with a blood test, although this is not routinely performed in Australia.
(time between becoming infected and developing symptoms)
From 3 to 6 days.
(time during which an infected person can infect others)
Yellow fever cannot be spread from person to person.
Treatment for yellow fever
There is no specific treatment for yellow fever. Supportive care to treat dehydration and symptomatic relief of pain may be required.
Prevention of yellow fever
Exclusion of people with yellow fever from childcare, preschool, school or work is not necessary but people should avoid being bitten by mosquitoes while they are unwell.
Vaccination is the single most important measure for preventing yellow fever. Vaccination is recommended for all travellers to countries where yellow fever transmission occurs.
A number of countries have specific mandatory vaccination requirements for travellers entering that country. Many countries, including Australia, require travellers coming from yellow fever infected countries to show proof of immunisation upon entry. This should be kept in mind when planning a travel itinerary.
Personal protection and the environmental management of mosquitoes are very important in preventing infection in regions where the virus is present. See Fight the Bite for tips how to protect yourself and your family from mosquito borne diseases.
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