I gave the third and final installment of a 3-part webinar series on multidrug-resistant Gram-negative rods for 3M recently. You can download my slides here, and access the recording here.

During the webinar, I provided an overview of the available guidelines to control CRE and other resistant Gram-negative bacteria. I then identified gaps in the guidelines, in terms of definitions of standard precautions, outbreak epidemiology and who should be on the guidelines writing dream team. Finally, I discussed some controversial areas in terms of effective interventions: patient isolation, staff cohorting and selective digestive decontamination.

One of the most important points when considering infection prevention and control guidelines is the issue of ‘standard precautions’. What do we apply to every patient, every time? As you can see from Figure 1 below, ‘standard precautions’ is far from standardized. This is problematic when developing and implementing prevention and control guidelines.

Figure 1: differences in the definition of ‘standard precautions’.

I had the opportunity to ask the webinar audience a few questions throughout the webinar, which are outlined in Figure 2.

Figure 2: response to the questions from the 120 or so participants.

I was somewhat concerned but not that surprised that more than a quarter of the audience did not know where to access control guidelines for MDR-GNR. I suppose this means that we need to do a better job of signposting the location of the various guidelines available. Here’s a non-exhaustive list for starters:

• US CDC CRE Toolkit.
• US AHRQ CRE Toolkit.
• UK Public Health England CPE Tookit.
• UK ESBL guidelines.
• ECDC risk assessment on the spread of spreading (CPE).
• Canadian guidelines for carbapenem resistant GNB.
• Australian recommendations for CRE control.
• ESCMID MDR-GNR control guidelines.

There was a fairly even split between active and passive surveillance to detect outbreaks. The problem with relying on passive surveillance (i.e. clinical cultures) is that there’s a good chance that the ‘horse will have bolted’, and you have a large outbreak on your hands, before a problem is detected. For this reason, I favour active surveillance.

But who to screen? In the case of CRE, I was pleased to see that virtually nobody said nobody. There was a pretty even split between everybody, high-risk individuals or all individuals in high-risk specialties. Accurately identifying individuals who meet screening triggers is operationally challenging, as outlined by the “backlash” to the UK toolkit, so I think screening all patients in high-risk specialties (e.g. ICU) makes most sense.

So, what works to control MDR-GNR transmission? We don’t really know, so are left with a “kitchen sink” (aka bundle approach) (more on this in my recent talk at HIS). We need higher quality studies providing some evidence as to what actually works to control MDR-GNR. Until then, we need to apply a healthy dose of pragmatism!