George Bush Sr in 'good spirits' as spokesman signals improving health Former US president George HW Bush has been in and out of the hospital in Houston since early November. Photograph: Tom Pennington/Getty Images Former president George Bush Sr is in "good spirits" amid signs of recovering health, even singing with doctors and nurses treating him at a Houston hospital, his spokesman said on Friday. The 88-year-old was admitted to the Methodist hospital's intensive care unit on Sunday, after a series of setbacks including a persistent fever. But in the latest update on his condition, the president's spokesman Jim McGrath said Bush "continues to improve" although he remains in intensive care. "The president is alert and, as always, in good spirits - and his exchanges with doctors and nurses now include singing," McGrath said. He added that doctors and the Bush family remained "cautiously optimistic that the current course of treatment will be effective." Bush, the oldest living former president, was admitted to hospital on 23 November for a stubborn cough related to bronchitis, after being in and out of hospital after complications linked to the illness. On Wednesday, it was disclosed that a fever that had kept Bush in the hospital over Christmas had worsened, and that doctors had put him on a liquids-only diet. Bush has lower-body Parkinsons, which causes a loss of balance, and has used wheelchairs for more than a year, McGrath told Reuters in an email.