Secretary of State John Kerry has paid tearful thanks for the outpouring of good wishes for his wife Teresa Heinz Kerry and says her condition is improving.

 Kerry, looking weary, was speaking at the opening of U.S.-China talks at the State Department Wednesday. Kerry returned to Washington from his wife's hospital bedside in Boston.

Kerry said: "Teresa is doing better, under evaluation and we hope improving."

He says he wanted to t hank everybody for, quote, "the remarkable outpouring of good wishes. It's really been very special." He adds  that when Mrs. Kerry is able, she will "tell everyone herself."

The  74- year-old Kerry was hospitalized after becoming ill Sunday on the Massachusetts island of Nantucket, where the couple owns a home.