A virus discovered only last year may be carried by as much as 10 percent of the general population and appears to be transmitted in blood products, according to a new research. There's little evidence, however, that transfusion-transmitted virus (TTV) causes disease, although that possibility has not been eliminated entirely. Two research teams one in England and the other in Scotland, looked tor TTV in various groups of people. They found it in all groups, significantly, however, it was not more common in people with chronic liver problems, suggesting the virus is not the cause of them.