It is believed that ten million intravenous drug users are infected with hepatitis C ; China ( 1.6 million ) , the United States ( 1.5 million ) , and Russia ( 1.3 million ) have the highest absolute totals .
In twelve of the countries in the study , more than 80 % of all IV drug users had Hepatitis C. Across the world , as many as ten million IV drug users are thought to have Hepatitis C ; the highest totals are in China ( 1.6 million ) , the United States ( 1.5 million ) , and Russia ( 1.3 million ) .