Clinical data and risk factors for outbreak patients.

1)Except urinary catheter.2)I = admission to ICU, S = recent surgery (laparotomi), R = artificial ventilator use, D = subjected to haemodialysis.3)Patient 1, being readmitted to SH-K, and patient 2 had been hospitalized in the same corridor for two days in March 2008 at SH-K although at separately staffed wards (Med. 2A-K and Med. 2C-K). Measures for contact isolation were not implemented for patient 1 on this occasion.4)Patient 4 and patient 5 had been admitted simultaneously to the ICU-A, and had also been referred to a tertiary hospital (OUS-RH) at overlapping intervals.5)Patient 3 and patient 4 were hospitalized in the ICU-A two days apart.6)LOS = length of stay (days).7)Overlap between patients in time and wards.8)Anti G-negative antibiotics prior to diagnosis