 Marburg virus was first described in 1967.During the 1960s it was noticed during small outbreaks of Marburg virus disease in the German cities Marburg and Frankfurt and the Yugoslav capital Belgrade.German workers were exposed to tissues of infected grivet monkeys (African green monkey)("Chlorocebus aethiops") at the city's former main industrial plant, the Behringwerke, then part of Hoechst, and later part of CSL Behring.