After Curing Hepatitis C, Gilead Works to Vanquish More Viruses

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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.