An acute, infectious, hemorrhagic viral disease. It is characterized by sudden onset of fever, bradycardia, and headache; with jaundice and hemorrhaging occuring in severe cases.
- Sudden onset of fever, slow pulse, and headache. Severe cases progress to intense albuminuria (excessive amounts of the protein albumin in the urine), jaundice, and hemorrhage--in particular, hematemesis, or a "black" vomit of blood.
- This stage lasts 2 to 5 days, and is characterized by sudden onset of a fever of 102 to 104 F.
- Other symptoms include: flushed face, injected eyes, nausea, vomiting, constipation, epigastric distress, headache, muscle pains (especially in the neck, back, and legs), severe prostration, restlessness, and irritability.