WASHINGTON - Scientific sleuths have a new suspect for what's been killing billions of honeybees: a virus previously unknown in the United States. The scientists report using a novel genetic technique and old-fashioned statistics to identify Israeli acute paralysis virus as the latest potential culprit in the widespread deaths of worker bees, a phenomenon known as colony collapse disorder. Next up are attempts to infect honeybees with the newfound virus to see if it's indeed a killer. "At least we have a lead now we can begin to follow. We can use it as a marker and we can use...