Visitors to the Healthy Facilities Institute (HFI) website often post questions pertaining to the industry. Here are two examples questioning disinfection and cross-contamination issues:

• How important are textiles such as doctor or nurse lab coats in transmitting disease?
• How does this importance weigh against the importance of sanitizing or disinfecting hard surfaces?
 
Answers to these questions are provided courtesy of Benjamin Tanner, PhD, president or Antimicrobial Test Laboratories.
 
Question - How important are textiles such as doctor or nurse lab coats in transmitting disease?
 
Answer - Microbiologists understand that fomites (inanimate objects) can serve as transmission vehicles for microorganisms.  Most disinfection and sanitization focuses on hard, non-porous surfaces such as tables, floors, and doorknobs,  but it is well known that textiles are a surface of concern within the healthcare environment.  Textiles tend to transmit fewer pathogens per touch than a similarly contaminated hard surface, but in my laboratory's experience, microorganisms survive longer in/on textiles than on hard surfaces.  For example, a study from 2009 showed 24% of doctors' white lab coats to be contaminated with S. aureus (a close cousin of MRSA).  That study did not use a sensitive sampling technique, so the incidence of contamination is probably even greater.  Other textiles such as privacy curtains are also frequently contaminated.  One study showed that within one week of laundering, 92% of privacy curtains showed MRSA or VRE.
 
Question - How does this importance weigh against the importance of sanitizing or disinfecting hard surfaces?
 
Answer - Sanitization of soft surfaces such as privacy curtains and lab coats should be done in at least the same frequency as surface disinfection, since patient and doctor contact with soft surfaces is reasonably common.  Unfortunately, the optimal frequency of sanitization of soft surfaces is not known.  Some studies indicate that surfaces become re-contaminated within just a few hours after sanitization, so sanitization multiple times per day would likely give the maximum benefit.