Patient beds: 70% (14/20); Bedside cabinets of patients: 65% (13/20); Surface of ventilator: 65% (13/20); Endoscopic tools: 45.60% (21/46); Hand of Surgeon after washing: 12.50% (5/40); Number of microbiological survey samples: 246; Average number of bacteria: 89 CFU / sample.