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(from a corruption of the English word “dandy,” after the swaying gait of the patient), an acute viral disease characterized by fever, meningitis, inflammation of the joints, and a rash. It is recorded in countries with a tropical climate (the Mediterranean region, Australia, the Philippines, New Guinea, and the Panama Canal Zone). The disease is not found in the USSR. The source of infection is an infected individual and several species of monkeys. The principal carrier is the mosquito Aëdes aegypti. Preventive measures include the extermination of mosquitoes, drainage of swamps, isolation of patients, and quarantine to prevent the transmittal of the disease to countries that are free of it.