The Hot Zone In October of l989, Macaque monkeys, housed at the Reston Primate Quarantine Unit in Reston, Virginia, began dying from a mysterious disease at an alarming rate. The monkeys, imported from the Philippines, were to be sold as laboratory animals. Twenty-nine of a shipment of one hundred died within a month. Dan Dalgard, the veterinarian who cared for the monkeys, feared they were dying from Simian Hemorrhagic Fever, a disease lethal to monkeys but harmless to humans. Dr. Dalgard decided to enlist the aid of the United States Army Medical Research Institute of Infectious Diseases (USAMRIID) to help diagnose t