Prince Philip in good spirits as health improves

(CBS/AP) Queen Elizabeth II's husband, Prince Philip, is on the mend.

Royal officials said Wednesday that his condition has improved considerably but the prince will likely remain in the hospital for the next few days for treatment of a bladder infection.

Buckingham Palace said Philip is being treated with antibiotics and "is in good spirits."

Philip was hospitalized on Monday with a bladder infection and forced to miss much of the celebration of the queen's 60 years on the throne. His son Prince Edward told reporters Philip watched the Diamond Jubilee events unfold on television.

It's not clear whether  the prince will be released in time for his 91st birthday on Sunday.

Philip, who is also known as the Duke of Edinburgh, is a former naval officer who married the then Princess Elizabeth in 1947. His health remained robust through his 80s, but he has appeared frailer in recent years.

When he turned 90, he said he was "winding down," and he has cut back on official duties. But he still carries out engagements, both with his wife and on his own.

The prince spent four nights in the hospital over Christmas after suffering chest pains and underwent a successful coronary stent procedure.