I have been waiting for a numerical estimation on HCV risk factor #1, blood transfusions, and found it in the above YouTube video. If you read a lot of HCV reports on PUBMED, you know that Dr. Harvey J. Alter is a superstar. Dr. Alter’s talk is 38 minutes short. He jokes as he gives a brief historical overview of the facts that laypeople can understand.
He states that in the era before testing for hepatitis was available, blood transfusions CAUSED about 4,800,000 cases of hepatitis C. No wonder this epidemic is so bad, especially in the veteran population (2013 post: Blood sources for U. S. troops in Vietnam.)
This is a must see.