Figure 1

Timing of control measures and incidence of isolation of P. aeruginosa in the NICU during the study period. Squares and triangles represent neonates colonised or infected by P. aeruginosa, respectively. The following letters indicate the infection control interventions performed: A, alert surveillance for P. aeruginosa, collection of strains isolated from clinical samples, and reinforcement of contact isolation precautions; B, environmental microbiological sampling; C, reporting of PFGE analyses to staff members; D, thirty minutes daily educational programme on hand disinfection carried out in the ward for one week.