Hello Mr. Fredro, did you get anti-viral treatment for the Hep B? When people are coinfected with Hep B and Hep C, taking Mavyert alone will be a big risk to reactivate Hep B virus. In this case doctors will consider treating both infections at the same time, with separate medication of course. First you'll need to get a blood test, check the liver function, HBV antibody and antigen, then your doctor will decide on the medication. You were infected 40 yeas ago doesn't mean you're currently infected.