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 the case. On November 2