Yellow fever is a serious infection, spread through the bites of infected mosquitoes. It is not contagious between infected humans, & is most common in areas of high mosquito density.
Commonly affected locations
Sub-Saharan Africa, South America, Central America, the Caribbean
Symptoms of yellow fever begin around three days after being infected, & include fever (body temperature of 38C & above), headache, nausea, vomiting, muscle pain, photosensitivity, malaise, & loss of appetite. In more serious cases, symptoms include jaundice (the yellowing of the skin that gives the disease its name), bleeding from the eyes, mouth, or nose, & vomiting or passing blood in the stool.