Former President George H.W. Bush remained hospitalized on Friday but was showing signs of improvement, a family spokesman said.
"President Bush remains in the intensive care unit at Methodist Hospital, where he continues to improve," spokesman Jim McGrath said in a prepared statement. "The president is alert and, as always, in good spirits -- and his exchanges with doctors and nurses now include singing."
Bush, 88, was admitted to the Houston hospital on Nov. 23 suffering from a bronchial cough. While the cough has lessened, McGrath said earlier this week, a persistent fever prompted doctors to move him into the intensive care unit on Sunday.
"The Bushes thank everyone for their prayers and good wishes and, like their doctors, are cautiously optimistic that the current course of treatment will be effective," McGrath said Friday.