Atti del 52° Congresso Nazionale: Società Italiana di Igiene, Medicina Preventiva e Sanità Pubblica (SItI)

ORs environmental data have been collected since July 2018 at IRCCS San Martino Hospital in Genoa, Italy (5 800 personnel, 1 327 beds, 350 000 m 2 surface, 55 buildings, 48 ORs). We adopted case definitions for HAI as reported in ECDC's Point Prevalence Survey protocol (version 5.3), considering an HAI, when not specified, related with the surgery when arose in the first 48h after the surgery. Patients will be retrospectively followed both in the post-operative stay and in eventual outpatient accesses for 30 (90 in case of implant) days after the surgery. Hospital and demographic data will be obtained through the hospital's informatics systems. Air particulate and air microorganisms sampling are carried out respectively with AeroTrak Portable Particle Counter (model 9500) and SAS Super 180 Microbial Air Sampler. The presence of other possible risk factors for OR associated HAI insurgence (such as the nature of the surgery or the operating team's behaviour) will be also indicated.