London ( CNN ) -- Queen Elizabeth II visited her husband , Prince Philip , on Wednesday in the London hospital where he is receiving treatment for a bladder infection . The Duke of Edinburgh , who will turn 91 on Sunday , was taken to King Edward VII hospital Monday after falling ill during the queen 's Diamond Jubilee celebrations over the weekend , including Sunday 's rain-swept river pageant . He missed a pop concert held at Buckingham Palace on Monday and was absent from the queen 's side for Tuesday 's events , seen as the ceremonial climax of the jubilee festivities . They included a service of thanksgiving at St. Paul 's Cathedral , a carriage procession and a flypast at the palace . The queen did not speak to the media on her way into the hospital . Prince Andrew later joined his mother inside . The queen , who spent about 50 minutes at the hospital , had earlier attended a lunch with commonwealth leaders . A statement on the official British Monarchy website Wednesday said the Duke of Edinburgh 's condition had `` improved considerably '' since he was admitted to the hospital . `` The treatment of his infection continues with antibiotics . He is likely to remain in hospital over the next few days . He is in good spirits , '' the statement said . Prince Edward , who visited Prince Philip 's hospital room Tuesday , said his father was recovering but needed rest . He also said the Duke of Edinburgh had watched the day 's proceedings on television . He is expected to remain under observation for several days . Prince Philip was `` disappointed '' not to take part in Tuesday 's events , the queen 's press secretary said in a statement Monday . CNN 's Max Foster and Alexander Felton contributed to this report .
NEW : Queen Elizabeth II spent about 50 minutes visiting with her husband at a hospital . The Duke of Edinburgh was admitted to the hospital Monday . He is being treated with antibiotics and will probably be hospitalized for several days . Prince Philip , who turns 91 on Sunday , missed some Diamond Jubilee events .