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Teresa Heinz Kerry moved to Spaulding

Teresa Heinz Kerry spoke at the United Jewish Communities 2004 International Lion of Judah Conference.

AP/File

Teresa Heinz Kerry spoke at the United Jewish Communities 2004 International Lion of Judah Conference.

WASHINGTON — Teresa Heinz Kerry’s condition has been upgraded from “fair” to “good” and she has been transferred from Massachusetts General Hospital to Spaulding Rehabilitation Hospital in Boston to complete her recovery, according to a spokesman for her husband, Secretary of State John F. Kerry.

But doctors have yet to diagnose what caused a seizure she suffered at the family’s Nantucket home on Sunday. Doctors previously ruled out a heart attack, stroke, or brain tumor.

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“Doctors have concluded that Mrs. Heinz Kerry suffered a seizure on Sunday, but they are still determining its precise cause,” spokesman Glen Johnson said in a statement.

The secretary of state, who has been splitting his time between Boston and Washington, was also quoted by Johnson expressing gratitude for all the outpouring of support for his wife in recent days.

“Let me confirm: It helps you get better,” Kerry said. “We are blessed to have so many people care about Teresa, and by the continued grace of God and the prayer of everybody, she will soon share herself just how much she appreciates every last expression of kindness directed toward her and our family.”

The Kerrys expressed particular gratitude to the Nantucket Fire Department, which rushed Heinz Kerry from their vacation home to Nantucket Cottage Hospital on Sunday afternoon, where she was listed in critical condition before being stabilized and flown to MGH.

“The Secretary and Mrs. Heinz Kerry want to pay special tribute to the Nantucket Fire Department for its ambulance services, to Nantucket Cottage Hospital for its initial treatment, and to Massachusetts General Hospital, which seamlessly assumed responsibility for her care,” Johnson said.

The medical care at MGH, he said, has overseen by Dr. Lee Schwamm and Dr. Leigh Hochberg.

“The staff at Spaulding has also exhibited the same remarkable professionalism, all of which has been extremely comforting to both patient and family,” Johnson added.

Bryan Bender can be reached at bender@globe.com. Follow him on Twitter @GlobeBender

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