Purpose. Oral chemoprophylaxis has been advocated to reduce the incidence of Candida colonization and infection. However, Candida prophylaxis in intensive care unit (ICU) is still a matter of debate.

Methods. Randomized, single-center trial studying single drug (nystatin) versus control in surgical ICU patients. Multiple-site testing for fungi were performed in each patient at ICU admission (T0) and subsequently every 3 days (T3, T6, T9…). The primary evaluation criterion was the time course of colonization index (CI) during ICU stay.

Multiple-site testing for fungi included: tracheal secretions, pharingael swab, stomach contents, rectal swab, groin skin fold swab, urine, and blood. These tests will be performed in each patient at ICU admission (T0) and subsequently every 3 days throughout the ICU stay (T3, T6, T9…), as routine in our ICU.The specimens were placed in a dry medium and taken to the Mycology Laboratory. Group assignment was not indicated on specimens, the mycologists were therefore blinded to treatment allocation.

Each specimen was directly microscopically examined and cultured on Sabouraud media.

Inclusion Criteria:

• surgical patients admitted to our ICU older than 18 years of age and expected to require invasive mechanical ventilation for more than 48 h.

Exclusion Criteria:

• pregnancy,
• proven Candida infection,
• prophylactic or curative antifungal treatment within the last 2 months,
• contraindication to oral drug administration,
• known allergy to nystatin or its derivatives, and prior inclusion in the study