Environment of Care
What to know
The environment of care includes air handling, water systems, surfaces, and waste. Candidates must understand ventilation requirements (negative-pressure rooms for airborne isolation, positive-pressure for protective environments), air changes per hour, and the role of HEPA filtration. Water systems are linked to Legionella, Pseudomonas, and nontuberculous mycobacteria; know the importance of flushing, temperature control, and monitoring. Surface contamination matters for pathogens like C. difficile and norovirus. Construction and renovation require infection control risk assessment (ICRA).
Traps
- Confusing negative pressure (keeps contaminants in) with positive pressure (keeps contaminants out).
- Forgetting that water is a reservoir for Legionella and Pseudomonas.
- Ignoring construction dust as a fungal (Aspergillus) risk.
- Assuming routine environmental culturing is required (it generally is not).
- Overlooking hand hygiene stations and waste segregation.
Worked example / rule of thumb
During hospital construction adjacent to an immunocompromised unit, an ICRA is performed, barriers erected, and HEPA filtration used to prevent Aspergillus exposure. Rule of thumb: negative pressure for airborne isolation (TB, measles), positive pressure for protective environments (transplant, neutropenic).