The concensus is that it has been present in the blood system for many years and has remained undetectable until recently due to advanced testing. It does appear to be related to other hepatic viral contaminents. It may have a long incubation period of many years before demonstrating physiological manifistations. With so many people testing positive for TT it is thought that it would cost too much to defer these people from donating blood as it would result in severe shortages. I say lets spend our efforts on safe alternatives to blood.
Lets develop synthetic blood that is forever free from contaminents.
We have been following TT very closely for the past few years. And here on FR for at least a few months. I believe we discussed a report from China some bit ago regarding the finding of TT in the liver of a patient who died of liver cancer. Perhaps he was on to something.