The MDRO medical abbreviation means multidrug-resistant organism, a germ, usually a bacterium, that is no longer killed by one or more classes of antibiotics that would normally work against it. It is an umbrella label rather than the name of one specific germ.
Patients and families often see MDRO on a hospital door sign, an admission screening result, a nursing home transfer form or a discharge summary. Seeing it does not mean someone is sicker than others, and it often reflects colonization rather than active infection. This page explains what falls under the label, how it is written in charts and what the precautions mean.
At a glance
Stands for
Multidrug-resistant organismPlural
MDROsCommon examples
Where you see it
Infection control notes, isolation signs, transfer formsUsual precautions
Contact precautions in many hospitalsDo not confuse with
MDR TB, a resistant form of tuberculosis with its own rulesSpecialty
Infection prevention, infectious disease
What the MDRO medical abbreviation covers
Bacteria can change over time so that antibiotics stop working against them. When a germ resists several antibiotic groups, infection prevention teams call it an MDRO. The label helps staff take steps to keep it from spreading from one patient to the next.
Hospitals and public health agencies each keep their own list of which organisms count, but the core group is broadly similar from place to place. The label is about the germ, not about anything the patient did.
Common organisms grouped under MDRO
| Shorthand | Full name | Usual setting |
|---|---|---|
| MRSA | Methicillin-resistant Staphylococcus aureus | Skin, nose, wounds, blood |
| VRE | Vancomycin-resistant enterococcus | Gut, urine, wounds |
| CRE | Carbapenem-resistant Enterobacterales | Gut, urine, blood |
| ESBL | Extended-spectrum beta-lactamase producing bacteria | Urine, gut |
| MDR Pseudomonas or Acinetobacter | Resistant gram-negative bacteria | Lungs, wounds, devices |
Some facilities also track Candida auris, a resistant yeast, alongside these bacteria. Its full spelling is used in charts because there is no common short form.
Colonized versus infected
A person can carry an MDRO on the skin, in the nose or in the gut without any illness. This is called colonization, and a screening swab may be the only sign. An infection means the germ is causing disease, such as a urinary infection, pneumonia or a wound infection, and needs treatment.
Charts often say which one applies. Both can lead to precautions, because a person who carries the germ can still pass it to others even when well.
On an admission note: "Hx MDRO, MRSA nares positive on prior admit, no active infection." This means MRSA was found in the nose on an earlier stay, it is not causing illness now, and the team will follow the hospital's precaution policy.
What contact precautions mean for visitors
Many hospitals place a patient with an MDRO on contact precautions. A sign on the door tells staff and visitors to clean their hands and, depending on local policy, to wear a gown and gloves when entering. Equipment such as a blood pressure cuff may stay in the room. These steps protect other patients, who may be more vulnerable, and the person's own family.
Policies differ between hospitals and long-term care homes. Some facilities relax precautions for certain organisms, so the same person may be handled differently in two settings. Staff can explain the local rules, and PPE is the shorthand for the protective gear involved.
Why resistance matters for treatment
When an infection is caused by an MDRO, the usual first-choice antibiotics may not work. Doctors use culture results and sensitivity testing to find a drug that does, which can mean a different medicine, a longer course or an IV route. The ABX entry explains how antibiotic shorthand reads in orders.
Infection labels like this one appear throughout the conditions list.
Common concerns from families
- Is this germ causing an infection, or is it colonization only?
- Which precautions should visitors follow, and for how long?
- Will this label stay on my record for future visits?
- What can we do at home to lower the chance of spread?
Precaution rules and treatment choices for resistant germs are set by each facility and care team. Ask the nurse or infection prevention staff to explain what applies to you or your family member.
Frequently asked questions
What does MDRO mean in a hospital?
MDRO means multidrug-resistant organism, a germ that resists several types of antibiotics. Hospitals use the label to decide on isolation steps such as contact precautions.
Is MDRO the same as MRSA?
MRSA is one type of MDRO. MDRO is the wider group that also includes VRE, CRE, ESBL-producing bacteria and other resistant germs.
Does MDRO mean I am contagious?
A person with an MDRO can pass the germ to others through touch and shared surfaces, even without symptoms. Hand cleaning and contact precautions are used to lower that risk.
Can an MDRO go away?
Colonization sometimes clears over time, and some facilities rescreen before removing precautions. Policies vary, so the care team can say what applies in your case.
Why does my door have an MDRO sign?
The sign tells staff and visitors to follow contact precautions, such as hand cleaning and sometimes gowns and gloves. It is a routine infection prevention step.