Multi-Drug Resistant Organisms (MRSA, CPE, VRE): Screening and Isolation in Care Homes

Multi-drug resistant organisms — MRSA, CPE and, less commonly, VRE — are a permanent feature of care home infection control, distinct from the seasonal outbreaks of norovirus or flu that tend to dominate attention. Unlike an outbreak that peaks and clears, a resident colonised with one of these organisms may carry it for months or years, which means care homes need a working, everyday approach to screening and isolation rather than a one-off response plan.

What These Organisms Actually Are

MRSA (meticillin-resistant Staphylococcus aureus) is the most widely known, but care homes increasingly encounter CPE (carbapenemase-producing Enterobacterales) and, less frequently, VRE (vancomycin-resistant Enterococcus). All three share a defining feature: they resist antibiotics that would normally treat the infections they can cause, which makes an active infection harder to treat if one develops. Importantly, colonisation is not the same as infection — a resident can carry MRSA or CPE on their skin or in their gut without being unwell, and most colonised residents never go on to develop an active infection at all.

Screening: When and How

Screening practice varies by local health protection guidance and by organism, but the general principle is consistent: screening is usually targeted rather than universal, focused on residents being admitted from hospital, residents with recent hospital stays abroad, or residents in a unit where a case has already been identified. Screening typically involves simple swabs — nose, skin, wounds, or groin for MRSA; rectal swabs for CPE — sent to a laboratory for culture. A positive result should trigger a clear, predetermined pathway rather than uncertainty about what happens next, which is why care homes benefit from agreeing a screening and response protocol with their local infection prevention and control team in advance, rather than improvising when the first positive result arrives.

Isolation: Proportionate, Not Automatic

A positive screening result does not automatically mean strict isolation. For most colonised residents going about normal daily life, standard infection control precautions — good hand hygiene, appropriate use of PPE for personal care, and careful management of any wounds or invasive devices — are sufficient, and isolating a colonised-but-well resident from all social contact can cause real harm to their wellbeing for very little infection control benefit. Isolation becomes more clearly indicated where a resident has an active, weeping wound, an indwelling device such as a catheter, or where they are part of a wider outbreak investigation. This proportionate approach mirrors the same underlying principle covered in our guide to outbreak management and infection control — precautions should match the actual transmission risk, not a blanket assumption.

Standard Precautions Are the Real Workhorse

The single most effective control measure for all of these organisms is consistent, everyday standard precautions applied to every resident, not just those known to be colonised — because a resident can be colonised without ever having been screened or diagnosed. Good hand hygiene between residents, correct use of gloves and aprons for personal care, and safe handling of laundry and waste do more to prevent transmission across a care home than isolating the small number of residents who happen to have a positive test on file.

Communicating Without Stigma

How a care home talks about MRSA, CPE or VRE colonisation matters almost as much as the clinical response. Residents and families can understandably feel alarmed by an unfamiliar term, and clumsy communication can lead to a colonised resident being unnecessarily excluded from communal activities or treated differently by staff who don't understand the difference between colonisation and active infection. Clear, calm explanation — what the result means, what precautions are and aren't needed, and reassurance that colonisation alone doesn't make someone a danger to others — helps avoid this.

Working With Hospitals on Transfer

Multi-drug resistant organism status should always be communicated clearly at points of transfer, in both directions. A resident being admitted from hospital should arrive with clear information about known colonisation status, feeding directly into the kind of thorough handover set out in our guide to hospital discharge and transitions of care. Equally, if a care home resident is admitted to hospital, staff should ensure the hospital is told about any known colonisation so appropriate precautions travel with the resident rather than being rediscovered from scratch.

Frequently Asked Questions

Does a positive MRSA or CPE result mean a resident can't join communal meals or activities? Not usually. For a well, colonised resident without an open wound or device, standard precautions are normally sufficient, and social isolation should be avoided unless there's a specific clinical reason for it.

How long does colonisation last? It varies considerably by organism and individual — some residents clear colonisation within weeks, others carry it for years. Ongoing management should be guided by your local infection prevention and control team rather than a fixed assumption.

Should staff be screened too? Routine staff screening isn't standard practice in most care home settings; it's typically reserved for specific outbreak investigations on the advice of the local health protection team.

Multi-drug resistant organisms are manageable, everyday infection control business rather than a crisis, provided care homes have clear protocols and communicate calmly. Learnsignal's CPD courses for care staff cover infection prevention and control in more depth for teams building confidence in this area.