MRSA in Nursing Homes

MRSA is one of the most closely tracked healthcare-associated infections in the United States, and nursing homes sit at the center of its spread. The Centers for Disease Control and Prevention classifies MRSA as a "serious threat" in its 2019 Antibiotic Resistance Threats in the United States report, and CDC estimates there were about 323,700 MRSA cases in hospitalized patients and 10,600 MRSA-associated deaths in 2017. Peer-reviewed research shows colonization rates in long-term care are substantially higher than in acute-care hospitals, and federal regulators have repeatedly found that infection prevention deficiencies are the most common citation in nursing homes.

This guide is part of our nursing home neglect hub and walks through what MRSA is, how common it is in long-term care, how it spreads inside facilities, the federal rules that require prevention programs, the CDC-recommended prevention strategies, treatment considerations in older adults, and what families should do when they are worried about infection control in a loved one's nursing home.

What MRSA Is and Why It Matters in Long-Term Care

MRSA stands for methicillin-resistant Staphylococcus aureus. According to the CDC, it is a strain of Staphylococcus aureus that has developed resistance to several first-line antibiotics, including methicillin, oxacillin, penicillin, amoxicillin, and other beta-lactams. That resistance makes common infections harder and slower to treat, which matters most for frail older adults whose bodies have less reserve when an infection takes hold. CDC's 2019 Antibiotic Resistance Threats in the United States report categorizes MRSA as a "serious threat" alongside a small group of the country's highest-burden drug-resistant pathogens.

The same CDC report estimates that MRSA caused roughly 323,700 cases in hospitalized patients and about 10,600 deaths in 2017. Working with investigators at the University of Utah School of Medicine, CDC has separately estimated that six antimicrobial-resistant hospital-onset infections, MRSA among them, contribute more than 4.6 billion dollars in U.S. healthcare costs each year, a reflection of how expensive and prolonged drug-resistant infections can become.

How Common MRSA Is in Nursing Homes

A peer-reviewed review published in Clinical Interventions in Aging and indexed in PubMed Central reports that MRSA colonization rates in long-term care facilities range from roughly 10 percent to 50 percent of residents, substantially higher than the 5 to 10 percent range typically observed in acute-care hospitals. A multicenter study of 28 U.S. nursing homes published in Infection Control & Hospital Epidemiology put the median facility MRSA colonization prevalence at 36 percent, with a range from 20 percent to 54 percent, and found that a median 45 percent of residents harbored a multidrug-resistant organism with no prior known MDRO history, an "iceberg effect" that shows how routinely colonization goes unrecognized in long-term care.

National trends have stalled. A CDC MMWR Vital Signs analysis of Staphylococcus aureus bloodstream infections reported an estimated 119,247 S. aureus bloodstream infections and 19,832 associated deaths nationwide in 2017, with nearly all hospital-onset and healthcare-associated community-onset cases occurring in patients with recent healthcare exposure such as dialysis, surgery, or nursing home residence. The same analysis found that hospital-onset MRSA bloodstream infection rates had declined about 17.1 percent annually between 2005 and 2012 but then did not significantly change during 2013 through 2016, meaning earlier progress against healthcare-associated MRSA has plateaued.

CDC's 2021-2022 Antimicrobial Resistance Threats update reported that six hospital-onset antimicrobial-resistant infections increased by a combined 20 percent during the COVID-19 pandemic compared with pre-pandemic levels and that in 2022 most of those pathogens, including MRSA, remained above pre-pandemic levels, a reflection of how quickly infection control practices can degrade under stress.

Colonization versus infection

Not every resident who carries MRSA is sick from it. Colonization means the bacteria live on the skin or in the nose without causing symptoms; infection means the bacteria have invaded tissue or the bloodstream and are producing clinical disease. The distinction matters because colonized residents can still transmit MRSA to staff, roommates, and shared surfaces, which is why CDC infection control guidance treats known colonization as a prevention trigger even in the absence of active infection. The iceberg effect documented in the 28-nursing-home study is a reminder that colonization is often widespread and under-recognized, so prevention programs cannot rely on clinical signs alone.

Risk Factors in Nursing Home Residents

Several characteristics that are common in long-term care populations push MRSA risk higher. Peer-reviewed research in the Journal of the American Geriatrics Society found that nursing home residents with indwelling medical devices were significantly more likely to be colonized with MRSA, with indwelling device use independently associated with MRSA colonization at an odds ratio of roughly 2.0, and that the combination of device use with wounds or functional disability carried the greatest risk for cocolonization with MRSA and vancomycin-resistant enterococci.

Recent antibiotic use is another well-documented risk factor. A peer-reviewed study of MRSA bacteriuria in skilled nursing facility residents, published in Infection Control and Hospital Epidemiology, found that antibiotic use within the previous six months was independently associated with MRSA urinary colonization at an odds ratio of 2.9 with a 95 percent confidence interval of 1.5 to 5.5. That finding is part of why federal regulations now require nursing facilities to run antibiotic stewardship programs, discussed below.

Drawing from the CDC and peer-reviewed literature cited throughout this guide, the risk factors most consistently documented in nursing home residents include:

• Indwelling devices such as urinary catheters, feeding tubes, and central lines.
• Open wounds, surgical sites, and pressure injuries that break the skin barrier.
• Recent antibiotic exposure, particularly within the prior six months.
• Recent hospital stays and transfers between acute care and long-term care.
• Functional dependence and congregate living in shared rooms and common spaces.

How MRSA Spreads Inside a Facility

CDC's clinical overview of MRSA in healthcare settings states that MRSA usually spreads through direct contact with an infected wound or from contaminated hands, including the hands of staff and residents who are asymptomatic carriers. That makes hand hygiene the foundational prevention measure in nursing homes, because staff move between residents many times per shift during toileting, bathing, wound care, and transfers.

Contaminated surfaces matter too. A peer-reviewed environmental study of California nursing homes published in Infection Control & Hospital Epidemiology found that 16 percent of sampled surfaces across 10 facilities tested positive for MRSA, with a range from 0 percent to 46 percent, and significantly more contamination in facilities with higher transmission (19 percent versus 10 percent). In the same study, only 22 percent of ultraviolet cleaning marks were removed during routine cleaning, linking environmental cleaning gaps to higher MRSA burden.

Transfers between facilities amplify the problem. Peer-reviewed modeling research in Clinical Infectious Diseases found that adding nursing homes to models of hospital MRSA transmission substantially amplified regional spread, with a single nursing home outbreak producing an average 46.2 percent relative increase in affected hospitals and hospital outbreaks reaching roughly 90 percent of surrounding nursing homes within six months. The finding underscores that nursing homes function as reservoirs in the wider healthcare network, not isolated sites.

Federal Infection Prevention and Control Requirements

Federal regulations at 42 CFR § 483.80 require every long-term care facility certified under Medicare and Medicaid to establish and maintain an infection prevention and control program, or IPCP. The regulation specifies that the program must include a system for surveillance, written standards, policies, and procedures, the use of standard and transmission-based precautions, a procedure for handling residents with a communicable disease or infection, and an antibiotic stewardship program that includes "antibiotic use protocols and a system to monitor antibiotic use."

The same regulation, at 42 CFR § 483.80(b), requires each nursing facility to designate one or more individuals as an infection preventionist with primary professional training in nursing, medical technology, microbiology, epidemiology, or a related field. The infection preventionist must work at least part-time at the facility, complete specialized training in infection prevention and control, and serve as a member of the facility's quality assessment and assurance committee.

Enforcement of those rules has been uneven. A U.S. Government Accountability Office report on infection control in nursing homes found that infection prevention and control deficiencies were the most common type of deficiency cited in surveyed nursing homes, with 82 percent of all surveyed homes cited for an infection prevention and control deficiency in one or more years from 2013 through 2017, and roughly 40 percent of surveyed homes cited every single year during that window. The CMS survey tag that covers these deficiencies is F880, and it is the citation families will most often see on a facility's inspection history when infection control has broken down.

On the stewardship side, CDC publishes Core Elements of Antibiotic Stewardship for Nursing Homes, a seven-element framework covering Leadership Commitment, Accountability, Drug Experience, Action, Tracking, Reporting, and Education. CDC reports that 82 percent of U.S. long-term care facilities met all seven core elements in its most recent surveillance update, a substantial increase from earlier years. Stewardship matters for MRSA specifically because, as noted earlier, recent antibiotic exposure is independently associated with MRSA colonization in nursing home residents.

CDC-Recommended Prevention Strategies

CDC's 2006 Management of Multidrug-Resistant Organisms in Healthcare Settings guideline, which remains the agency's primary MDRO management reference, identifies hand hygiene, Standard Precautions for all residents, and Contact Precautions for residents with known or suspected MRSA infection or colonization as the core evidence-based components of MRSA prevention in healthcare facilities. Those practices are then layered in long-term care with a newer intervention called Enhanced Barrier Precautions, discussed below.

CDC's Enhanced Barrier Precautions (EBP) guidance, adopted as an infection control intervention for skilled nursing facilities in 2019 and updated since, recommends targeted gown and glove use during high-contact resident care activities such as bathing, incontinence care, transfers, wound care, and device care for residents with wounds, indwelling medical devices, or known colonization with an MDRO such as MRSA, even when Contact Precautions do not otherwise apply. Enhanced Barrier Precautions are designed specifically for the realities of long-term care, where residents often live for months or years and cannot be placed in hospital-style isolation.

A Cochrane systematic review of infection control strategies for preventing MRSA transmission in nursing homes for older people, indexed in PubMed Central, emphasized that hand hygiene is the single most important intervention, that comprehensive hospital-style isolation is often impractical because residents live in shared rooms, and that very high nursing assistant turnover, reported at roughly 85 percent annually in U.S. facilities at the time of the review, limits the effectiveness of training-based interventions. That finding reinforces that stable staffing is part of effective MRSA prevention, not a separate issue.

Drawing those pieces together, CDC-aligned MRSA prevention in nursing homes rests on:

• Hand hygiene for staff before and after every resident contact.
• Standard Precautions for all residents and Contact Precautions for those with known or suspected MRSA infection or colonization.
• Enhanced Barrier Precautions during high-contact care for residents with wounds, indwelling devices, or known MDRO colonization.
• Environmental cleaning and disinfection of high-touch surfaces and shared equipment, with periodic auditing of cleaning effectiveness.
• An antibiotic stewardship program implementing all seven CDC Core Elements to reduce unnecessary antibiotic exposure that drives resistance.

Treatment of MRSA Infections in Older Adults

Treatment decisions for MRSA are guided by the Infectious Diseases Society of America (IDSA) clinical practice guidelines for MRSA infections in adults and children, published in Clinical Infectious Diseases. IDSA recommends intravenous vancomycin at 15 to 20 mg/kg every 8 to 12 hours as the standard parenteral therapy for serious MRSA infections, with linezolid and daptomycin as alternatives. IDSA notes that daptomycin is FDA-approved for MRSA bacteremia and endocarditis at 6 mg/kg daily and should not be used for pneumonia because it is inactivated by pulmonary surfactant.

Pneumonia in older adults is a particular case. A retrospective cohort analysis in the Journal of the American Geriatrics Society reported that linezolid may be more efficacious than vancomycin for treating elderly patients with nosocomial MRSA pneumonia, and ATS/IDSA pneumonia guidance has suggested linezolid as preferred over vancomycin for MRSA pneumonia in many clinical contexts. Drug selection for any individual resident depends on kidney function, concurrent medications, allergies, and the site and severity of infection, all of which the prescribing clinician weighs against published guidelines.

Health Consequences of MRSA in Elders

CDC's clinical overview of MRSA in healthcare settings states that MRSA infections can progress to serious and life-threatening conditions including bloodstream infections, pneumonia, surgical site and wound infections, sepsis, and death. Older residents often present atypically, with new confusion, falls, or functional decline rather than a classic fever, which is why families who notice any sudden change around an existing wound, device site, or skin infection should raise the concern immediately rather than waiting for obvious symptoms.

Mortality data support that caution. Peer-reviewed research on MRSA carriage in nursing home residents reported that carriers had a relative risk of death within six months that was approximately 2.3 times higher than non-carriers, and a retrospective analysis of MRSA bacteremia found that older age (75 and above) was independently associated with roughly 2.5-fold higher overall mortality. A peer-reviewed meta-analysis indexed in PubMed Central reported that mortality among patients with invasive MRSA infection is approximately twice that of patients with methicillin-susceptible S. aureus infection, evidence that methicillin resistance itself contributes to poor outcomes in this population.

When MRSA Infection Reflects Infection Control Failure

No single MRSA case automatically means a nursing home broke the rules. Residents can arrive already colonized, and some infections occur despite careful practice. What tips a case toward an infection control failure is pattern. The GAO finding that 82 percent of surveyed nursing homes were cited for an infection prevention and control deficiency at least once from 2013 through 2017, combined with the CDC Vital Signs plateau in hospital-onset MRSA rates after 2012 and the pandemic-era rebound reported in CDC's 2021-2022 update, points to chronic gaps in practice, not isolated bad luck.

Documented problems with poor hygiene, inconsistent wound care, and understaffing often appear together in the same survey findings, and the Cochrane review noted earlier connects roughly 85 percent annual nurse aide turnover to reduced effectiveness of infection control training. MRSA can also intersect with nursing home abuse when willful neglect of wound care or hygiene contributes to harm.

F880, the CMS survey tag that covers infection prevention and control, is the citation to look for on a facility's inspection history when you are trying to understand whether MRSA in a loved one's room reflects a broader problem. Repeat F880 citations across multiple survey cycles are a signal that families should take seriously.

What Families Should Do

Families concerned about MRSA or general infection control in a nursing home can take several practical steps drawn from the federal rules above. None require a lawyer, and none preclude seeking legal guidance later.

• Ask the facility how it meets 42 CFR § 483.80: who the designated infection preventionist is, whether the antibiotic stewardship program covers all seven CDC Core Elements, and what the facility's hand hygiene monitoring looks like.
• Document wounds, indwelling devices, dressing changes, and any hygiene concerns with dates, photos where appropriate, and the names of staff involved.
• Request the resident's care plan and ask whether Contact Precautions or Enhanced Barrier Precautions apply and how they are being implemented.
• Review the facility's inspection history on the CMS Care Compare website for prior F880 infection control citations.
• Report concerns to the state survey agency and the long-term care ombudsman; both have authority to investigate infection control complaints.

Reporting contacts, hotlines, and survey agency procedures vary by state. See our state guides for Ohio, Pennsylvania, and Illinois to find the right intake line for your loved one's facility.

If MRSA or other infection control failures have caused serious harm and you want to understand your options beyond filing a regulatory complaint, you can speak to a lawyer about a confidential case review. Filing a regulatory complaint and seeking legal guidance are separate steps, and either or both can move forward at the same time.