Yellow fever is a serious viral infection that’s spread by the infected Aedes aegypti mosquito. The ‘yellow’ in the name refers to the jaundice that affects some patients. Up to 50% of those severely affected die from yellow fever if left untreated. The first symptoms usually consist of fever, muscle pain, prominent back ache, headache, shivers and nausea/vomiting. The second phase can affect several body systems with kidney function deteriorating. Vaccination, mosquito control and epidemic preparedness and response are the main ways of combating yellow fever.