Question: what are the three stages of yellow fever?
Answer: Stage 1 (infection): Headache, muscle and joint aches, fever, flushing, loss of appetite, vomiting, and jaundice are common. ... 
Stage 2 (remission): Fever and other symptoms go away. ... 
Stage 3 (intoxication): Problems with many organs may occur, including the heart, liver, and kidney.