Yellow Fever: Symptom and Causes


 Yellow fever has three stages:
  • Stage 1 (infection): headache, muscle and joint aches, fever, flushing, loss of appetite, vomiting, and jaundice are common. Symptoms often go away briefly after about 3-4 days.
  • Stage 2 (remission): fever and other symptoms go away. Most people will recover at this stage, but others may get worse within 24 hours.
  • Stage 3 (intoxication): problems with many organs occur. This may include heart, liver, and kidney failure, bleeding disorders, seizures, coma, and delirium.
Symptoms include:
If a person is bitten by an infected mosquito, symptoms usually develop after 3 – 6 days.
  • Irregular heart beats
  • Bleeding (may progress to haemorrhage) 
  • Delirium (state of violent mental agitation)
  • Fever
  • Headache
  • Bleeding from your nose, mouth and eyes
  • Yellow skin and eyes (jaundice)
  • Muscle aches
  • Red eyes
  • Seizures
  • Vomiting blood
 Yellow fever symptoms


 Yellow fever is caused by a virus (Flavivirus) that is spread by the Aedes aegypti mosquito
  • Humans and monkeys are most commonly infected with the yellow fever virus
  • When a mosquito bites a human or monkey infected with yellow fever, the virus enters the mosquitos bloodstream and circulates before settling in the salivary glands
  • When the infected mosquito bites another monkey or human, the virus then enters the hosts bloodstream, where it may cause illness
  • Yellow fever cannot be spread by close contact between two people
 Cause of yellow fever

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