Of 77 countries reviewed , 25 ( including the United States ) were found to have prevalences of hepatitis C in the intravenous drug user population of between 60 % and 80 % .
One study that looked at 77 countries showed that in 25 of these countries ( including the United States ) , between 60 % and 80 % ( or 6 to 8 out of every 10 ) of all IV drug users had Hepatitis C. and China .