This study examined how fungal infections spread in hospital settings by testing air and surfaces in Iranian hospital intensive care units. Researchers found that dangerous fungi like Aspergillus and Rhizopus were commonly present, especially in air ducts, and many of these fungi could resist common antifungal medications and disinfectants. The findings suggest that hospital environments serve as sources of infection for vulnerable patients and that better cleaning and air filtration systems are needed to protect hospitalized patients.