Deadly Ebola & Lassa Viruses May Be More Common Than Thought Wynne Parry, LiveScience Contributor Date: 08 November 2012 Time: 02:01 PM ETEbola and Lassa are hemorrhagic fevers, made memorable by the horrific symptoms that can accompany them. First identified about four decades ago, these killer viruses can cause their victims to bleed both internally and from the mucosal membranes of the eyes, nose and elsewhere. A severe infection can also produce neurological problems, including tremors and brain swelling. But mounting evidence indicates these terrifying diseases, which occur in Africa, may not be the terrifying new arrivals — called emerging...