Repeated tests of nasopharyngeal secretions for influenza viruses, parainfluenza virus, respiratory syncytial virus, and adenovirus were negative. Testing for antibodies to toxoplasma was suggestive of past infection. Cultures of specimens of blood, urine, and sputum were sterile. Polymerase chain reaction determination of buccal swab for H1N1 influenza A virus was positive. Urinary tests for Legionella antigens were positive.