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Marburg, Germany - August 1967
In late summer 1967, keepers of primates (Green Monkeys) in the Behring Company came down with high fever, internal hemorrhages and organ failure. Five of the 25 pa-tients died. Shortly thereafter, the infection was also reported from institutes in Frankfurt and Belgrade, which also kept Green Monkeys.
Scientists in Marburg succeeded in growing in guinea pigs the infectious agent, which was characterized as a virus by electron microscopy at BNITM on November 20th, 1967. Since the virus was also found in blood samples from the patients, it was regarded as the causative agent.