The yellow fever virus is transmitted primarily through the bite of infected mosquitoes. Infected primates are the hosts of the virus. The mosquitoes bite the infected primates and then bite others (human and non-human), thus spreading the disease. Humans become contagious shortly before the onset of fever and for 3–5 days after initial onset.
When a person becomes infected, it typically takes 3–6 days for symptoms to appear.
Take steps to avoid mosquito bites:
There is no specific treatment for patients with yellow fever. Patients who become infected should be hospitalized for supportive care and observation. Rest, fluids, and use of pain relievers and medication to reduce fever may help relieve these symptoms. Using certain medications, such as aspirin or other non-steroidal, anti-inflammatory drugs may increase the risk of bleeding. Yellow fever patients should stay indoors and away from mosquitoes during the first few days of illness. This way, other mosquitoes cannot be infected and spread the virus. The majority of people who become infected will have mild symptoms with complete recovery. Once people recover from yellow fever, they are usually immune to repeat infections.