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Most people recover from the infection, but it poses great risks for those who don’t. A new drug may cure 1 in 5 of these patients.

By Gina Kolata

A new drug has essentially cured 1 in 5 patients with chronic hepatitis B infections, researchers reported on Thursday, a feat that has stymied scientists for years.

“It’s the first major advance in the treatment of chronic hepatitis B in decades,” said Dr. William Jarnagin, a surgeon and liver specialist at Memorial Sloan Kettering Cancer Center.