Protecting Patients and Staff: Strategies to Reduce Measles Transmission in Healthcare Settings

Measles is a highly contagious viral disease that poses a serious threat in healthcare environments. With recent resurgences in measles cases both domestically and globally, healthcare facilities must remain vigilant and proactive in reducing the risk of transmission to protect vulnerable patients, visitors, and healthcare personnel. This blog post explores evidence-based strategies to mitigate the spread of measles in clinical settings, emphasizing the critical role of airborne isolation, staff vaccination, early identification, and environmental controls.

Understanding the Risk of Measles in Healthcare Environments

Measles is caused by the measles virus, which is transmitted primarily through respiratory droplets and airborne particles. According to the Centers for Disease Control and Prevention (CDC), measles is so contagious that if one person has it, up to 90% of the people close to that person who are not immune will also become infected [CDC, 2023]. The virus can remain infectious in the air or on surfaces for up to two hours after an infected person leaves an area.

Healthcare settings are particularly vulnerable to outbreaks due to the high concentration of immunocompromised individuals, infants who are too young to be vaccinated, and others with inadequate immunity. Transmission can occur even before the characteristic rash appears, which complicates early identification. As a result, healthcare facilities must implement comprehensive infection prevention strategies to reduce the risk of nosocomial (healthcare-acquired) measles infections. CDC has recently issued a general travel guidance regarding the importance of vaccination for those traveling internationally in an effort to curb continued spread of the disease.

Strategy 1: Implement Airborne Isolation Precautions

Airborne isolation is one of the most effective measures to prevent the spread of measles within healthcare facilities. Because the virus can remain suspended in the air for long periods, patients suspected or confirmed to have measles should be placed immediately in an airborne infection isolation room (AIIR), also known as a negative pressure room.

The CDC recommends that healthcare personnel use respiratory protection that is at least as protective as an N95 respirator when entering the room of a patient with measles [CDC, 2023]. These rooms should have:

• Negative air pressure relative to surrounding areas
• At least 12 air changes per hour (ACH) for new constructions and 6 ACH for existing rooms
• Direct exhaust of air to the outside or through HEPA filtration
• Evaluate the use of a portable, continuous air filtration/disinfection device when an AIIR is not available

Signage should be clearly posted, and visitor access should be limited. When AIIRs are not available, facilities should consider using a portable air filtration/disinfection device or transferring the patient to a facility with appropriate isolation capacity, if safe and feasible.

Strategy 2: Ensure Comprehensive Staff Immunization

Healthcare workers are on the front lines of exposure during outbreaks and must be adequately protected. All healthcare personnel should have documented evidence of immunity to measles, preferably through two doses of the MMR (measles, mumps, rubella) vaccine or laboratory evidence of immunity.

The CDC’s Immunization of Health-Care Personnel recommendations state that all healthcare workers born in 1957 or later should receive two doses of MMR vaccine unless they have other acceptable evidence of immunity [CDC, 2011]. Employers should maintain up-to-date immunization records and conduct periodic reviews to identify gaps in coverage. Staff who are not immune should be restricted from patient care duties during an outbreak or after exposure to a confirmed case.

Strategy 3: Prompt Identification and Triage of Suspected Cases

Early recognition of measles symptoms and swift isolation of suspected cases are essential. Triage protocols should include screening for rash, fever, and recent exposure or travel history to areas experiencing outbreaks. Patients with suspected measles should be given a mask and escorted directly to an AIIR, bypassing common waiting areas.

Healthcare facilities should train front-line staff to recognize the early signs of measles, including:

• High fever
• Cough, coryza, and conjunctivitis (the “3 Cs”)
• Koplik spots on the mucosa (preceding rash)
• Maculopapular rash spreading from the head downward

Prompt notification of the infection prevention team and public health authorities is crucial for outbreak control and contact tracing.

Strategy 4: Strengthen Environmental and Engineering Controls

Environmental cleaning and air management are central to infection prevention. In addition to using AIIRs, facilities should:

• Ensure that ventilation systems meet or exceed standards for infection control
• Use portable air filtration/disinfection units with HEPA filtration in high-risk areas when AIIRs are not available
• Allow sufficient time for airborne contaminants to clear before reusing a room

According to the CDC, the airborne precautions period for measles is four days after the rash onset, but immunocompromised patients may shed the virus longer and require extended isolation [CDC, 2023].

Strategy 5: Educate Staff and Patients on Prevention

Ongoing education and communication are critical. Staff should receive annual infection control training that includes measles transmission and prevention. Additionally, public-facing signage and patient education materials can help reinforce the importance of vaccination and isolation measures.

Visitors should be screened for symptoms and recent exposure prior to entry into high-risk areas such as neonatal ICUs, oncology units, or transplant wards. During active outbreaks, facilities may need to restrict visitor access altogether or require documentation of immunity.

Vigilance is the Best Defense

Measles is a preventable disease, but the consequences of healthcare-associated transmission can be severe, particularly for vulnerable populations. With its highly contagious nature and potential for airborne spread, measles requires a high level of preparedness and a commitment to best practices in infection prevention and control. By ensuring staff are vaccinated, implementing airborne isolation protocols, recognizing symptoms early, and maintaining strong environmental controls, healthcare facilities can protect patients and staff while reducing the risk of an outbreak.

References:

• Centers for Disease Control and Prevention. (2023). Measles (Rubeola). https://www.cdc.gov/measles/index.html.
• Centers for Disease Control and Prevention. (2011). Immunization of Health-Care Personnel. https://www.cdc.gov/mmwr/pdf/rr/rr6007.pdf.
• Centers for Disease Control and Prevention. (2023). Guidelines for Environmental Infection Control in Health-Care Facilities. https://www.cdc.gov/infectioncontrol/guidelines/environmental/.