LONDON (AP) — Prince Philip, husband of Queen Elizabeth II, has improved considerably but will likely remain in the hospital for the next few days for treatment of a bladder infection, royal officials said today.

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.

Buckingham Palace said today that Philip is being treated with antibiotics and “is in good spirits.”

It is not clear if the prince will be released in time for his 91st birthday on Sunday.

On Sunday, Prince Philip joined the queen and senior royals on the River Thames in cold, blustery weather for a pageant in honor of Elizabeth’s reign.

But the illness has forced Philip to miss several key events of the Diamond Jubilee celebrations, including a service of thanksgiving at St Paul’s Cathedral on Tuesday and a concert outside Buckingham Palace on Monday.

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