The 88-year-old wife of former President George H.W. Bush has been at Houston's Methodist Hospital since Monday.
No timetable has been given for her release but Bush family spokesman Jim McGrath has said she is doing well. He says her hospital stay, continuing Friday, is likely a result of physicians being extra cautious.
Bush and her husband, the 41st president, live in Houston during the winter and in Maine during the warmer months of the year.
Their 69th wedding anniversary is Monday.
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