Are you confusing HCV and HBV? The latter is a very big health problem in Asia; however, DAAs active against HCV are not active against HBV, so the HBV epidemic in Asia does not present a business opportunity for HCV drugs other than the interferons.
Here's an article on just a small slice of SE Asia: Vietnam
Asian Theater: Southeast Asia has high rates of hepatitis C infection. Currently, between 5 and 8 percent of the Vietnam population is infected with hepatitis C.2 Hepatitis C could have been transmitted to military personnel through tattoos, medical contact, sexual contact, and shared needles