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Ebola viruses from Zaire and Sudan were first isolated in 1976 at CDC (Center for Disease Control), Porton Down in the UK, and at the Institute for Tropical Diseases in Antwerp, Belgium. Immunological differentiation of these isolates from Marburg virus was immediately done in the Laboratory of Dr. Karl Johnson at CDC. Recognition that Zaire and Sudan strains were different came several years later in a collaborative effort led by Dr. Joseph McCormick at CDC. Thus, by rare coincidence, distinct new viruses made their appearance on the same continent at virtually the same time. The Ebola Reston strain was identified in 1989 in the laboratory of Dr. Peter Jahrling at USAMRIID, Frederick, MD. Most recently the Ebola Tai strain isolated by Dr. Bernard Le Guenno and colleagues at Institute Pasteur, Paris was identified in 1995.
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