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After Curing Hepatitis C, Gilead Works to Vanquish More Viruses

Gilead Sciences Inc., basking in the success of its cure for hepatitis C, is setting ambitious goals to vanquish two other major viral scourges: HIV and hepatitis B.

Even with some promising signs in early trials, the biggest biotechnology firm in the world faces long odds in finding a way to rid humanity of the diseases. And it’s unclear whether a cure for either virus would produce the kind of lucrative return that Gilead has earned from its treatments for hepatitis C.