In June 1999, a 29-year-old man came to the emergency department with right-sided flank pain, conjunctivitis, anorexia, fever, chills, increased thirst, and vomiting. He had lost 5 kg in weight, and was in acute renal failure. He was treated with steroids and discharged. In October, 1999, his 63-year-old father came to the emergency department with similar complaints. He was also in acute renal...