Dengue, Dandy Fever, or Break-bone Fever, an epidemic disease occurring in parts of India and in the East and West Indies. The chief symptoms of dengue are high fever, severe headache, pain and inflammation of the joints, and often on the third or fourth day of the disease there appears an erythematous eruption. On the sixth or seventh day of the disease the fever abates, but relapses are common. Dengue presents considerable similarity in many respects to relapsing fever. It is not often fatal.