Doctor in the House S05E04 - The Epidemic

The blundering Reggie Grace is feeling ill again so Waring decides to use a new computer to find out what his prognosis is and it turns out that he has typhoid. The hospital is sealed off and features on the evening news as a state of emergency is called. Ultimately a second opinion shows that Reggie has gastroentiritis and not typhoid after all. The machine was faulty - especially when it shows up that Lawrence Bingham is pregnant.