p<0.001) and chemotherapy (12.6% vs 1.9%, p<0.001). Admission to the intensive care unit (ICU) was significantly more frequent in surgical patients (35.4% vs 10.9%, p<0.001) as well as use of second and third generation cephalosporins (30.0% vs 17.6%, p=0.001; 64.6% vs 53.1%, p=0.007, respectively). Conclusion and relevance Age !65 years, use of PPIs, chemotherapy and fluoroquinolones were positively associated with the medical group and were significant predictors of CDI, whereas admission to the ICU and the use of second and third generation cephalosporins were positively associated with being in the surgical group and were significant predictors of CDI. We conclude that medical patients were more endangered with HA CDI than surgical patients.