United Press International, Newstrack-Science, Feb. 15, 2007 GALVESTON, Texas, Feb. 15 (UPI) -- U.S. medical scientists say they have discovered a technique that might lead to prevention of a fatal, virus-caused immune system failure. When a virus infects a person, it triggers a series of biochemical reactions in immune-system cells that usually result in the elimination of the virus and the infected person's recovery. But in the case of some of the world's deadliest pathogens -- including the 1918 influenza, Ebola, Marburg and Lassa fever viruses -- a sudden immune overreaction sends the infected person into a shock-like state from which he or she might never recover. Researchers at the University of Texas Medical Branch at Galveston say they believe they've found a way to spot the biochemical profile of an inappropriate immune response to viral infection -- an important step toward developing new therapies to prevent or halt a fatal immune system response.