We report an outbreak of Saccharomyces cerevisiae subtype boulardii fungemia among three intensive care unit roommates of patients receiving lyophilized preparations of this fungus. The fungemia was probably due to central venous catheter contamination and resolved after fluconazole treatment. The need for stringent application of proper hygiene when using a probiotic preparation of this organism is emphasized.
CASE REPORTSOutbreak cases. (i) Case 1. Case 1 involved a 34-year-old man hospitalized for hypoxia after head and thoracic trauma. He was placed on enteral nutrition, with insertion of a central venous catheter (CVC), and broad-spectrum antibiotic therapy was administered. On day 42 after admission (5 November 2000), he developed a fever, which was unsuccessfully treated with teicoplanin and imipenem. Multiple blood cultures yielded Saccharomyces cerevisiae. The fever and fungemia subsided under treatment with fluconazole at 400 mg/day. The CVC was removed 3 weeks after initiation of fluconazole treatment. The infectious episode resolved, but no catheter culture was performed.(ii) Case 2. Case 2 involved a 48-year-old man hospitalized for rupture of a cerebral aneurysm and fever. He was given enteral nutrition, and a CVC was inserted. Teicoplanin alone and then teicoplanin and meropenem were administered. On day 14 (10 November 2000), one blood culture yielded S. cerevisiae. On day 19, the CVC was removed and fluconazole therapy (400 mg/day) was immediately started. No catheter culture was performed. The fever subsided within 48 h of the initiation of fluconazole treatment.(iii) Case 3. Case 3 involved a 75-year-old woman admitted for acute myocardial infarction. She was given enteral nutrition, and a CVC was inserted. She was treated with various antibiotic regimens for several febrile episodes. On day 56 (10 April 2001), a blood culture yielded S. cerevisiae. The CVC was removed, leading to immediate defervescence. The CVC tip was positive for S. cerevisiae. Fluconazole therapy (400 mg/day) was started 2 days later and administered for 2 weeks.None of the three patients described above received any probiotic treatment.
Case 4 (incomplete report).A 35-year-old woman with multiple traumas who had been hospitalized in the intensive care unit (ICU) at the same time as patients 1 and 2 had blood cultures positive for S. cerevisiae. Unfortunately, her medical record was sequestered for forensic purposes and whether she had received probiotic treatment or not could not be determined. This patient improved and was transferred to the orthopedic division, from which she was discharged 2 months later.The outbreak setting was an eight-bed ICU in a 400-bed secondary-care hospital in Rome, Italy. During the year preceding the outbreak, about 20% of the ICU patients were hospitalized for emergency surgery, 12% were hospitalized for elective surgery, 18% were hospitalized for trauma, and 50% were hospitalized for medical diseases. The mean (Ϯ standard deviation) age of patients was 66 Ϯ 16 years, the mean ICU hospitali...