Don't worry, it can't hurt you—yet. Scientists have identified Reston ebolavirus—a member of the deadly Ebola group of hemorrhagic viruses—in domestic swine from the Philippines. The virus, which looks like a piece of yarn with a slight bend, is the only Ebola pathogen not known to cause disease in humans. Even so, the U.S. Centers for Disease Control and Prevention in Atlanta considers it a biosafety level 4 pathogen, reserved for the most dangerous and exotic diseases. Ebola and the closely related Marburg viruses are highly contagious, causing vomiting, diarrhea and bleeding with death rates as high as 90 percent....