MUNICH — The trial of John Demjanjuk on charges of accessory to the murder of 27,900 Jews as a death camp guard was called off for the day Wednesday after a doctor determined he was too ill to come to court. Presiding Judge Ralph Alt said the doctor examined Demjanjuk, 89, in a prison hospital two hours before the session due to begin, and determined that he had a fever caused by an unidentified infection.