Healthcare Professionals

We provide support and resources to healthcare providers across our district. See the following options for more information.

Measles

Measles is a Disease of Public Health Significance. All suspected or confirmed cases must be reported to the Health Unit. If you suspect or confirm a case of measles, report it immediately by phone at 705-474-1400 or toll-free at 1-800-563-2808, ext. 5229.

With the sharp increase in measles cases in Canada, including a large outbreak in Ontario and multiple cases being confirmed in our region, we urge all health care facilities to review the immunization status of their health care workers to ensure they are protected against measles.

Vaccination

Immunizing Healthcare Workers

According to the Canadian Immunization Guide, all healthcare workers should be immune to measles. Regardless of birth year, the criteria for measles immunity includes:

Documentation of vaccination with two doses of measles-containing vaccine on or after their first birthday

laboratory evidence of immunity

Documentation of lab confirmed infection.

By ensuring all healthcare workers are immune to measles, your facility can reduce the possibility of staff exclusion following exposure which will help maintain adequate staffing levels and minimize disruption in patient/resident care.

Routine serologic testing to determine the immunity of healthcare workers without immunization records is generally not practical. If a healthcare worker reports incomplete immunization or lacks adequate documentation of immunization, they should be considered unimmunized and started on an immunization schedule appropriate for their age and risk factors.

Measles-containing vaccine may be given regardless of possible previous receipt of the vaccine because additional adverse events associated with repeated immunization have not been demonstrated.

Measles-susceptible healthcare workers should receive 2 doses of measles-containing vaccine (i.e., Measles Mumps Rubella vaccine), administered with a minimum interval of 4 weeks between doses.

If a healthcare worker is exposed to a confirmed case of measles, and they do not meet the criteria for measles immunity, exclusion from the workplace is required from the 5th day after their first exposure to 21 days after their last exposure. If during this time, proof of immunity or documentation of previous infection is provided, they may return to work. Longer exclusion periods apply to those who receive immune globulin as post-exposure prophylaxis.

Should you require further information, please contact your facility’s Public Health Nurse or the Health Unit’s Communicable Disease Control program at 705-474-1400, ext. 5229.

Immunizing Patients

The routine immunization schedule for measles is found in the Publicly Funded Immunization Schedules for Ontario.

Individuals who live, work, travel to, worship in or spend time in areas where the risk of exposure to measles is higher are recommended to follow a different measles vaccination schedule as indicated in Public Health Ontario's Routine and Outbreak-related Measles Immunization Schedules. In Ontario, the following health unit districts are areas where the risk of exposure to measles is higher:

Chatham-Kent Health Unit
Grand Erie Health Unit
Grey Bruce Health Unit
Huron Perth District Health Unit
Lampton Public Health
Middlesex-London Health Unit
Southwestern Public Health
Region of Waterloo Public Health
Wellington-Dufferin-Guelph Public Health
Windsor-Essex County Health Unit

Infection Prevention and Control

The measles virus is spread by contact with respiratory particles through inhalation or contact with mucous membranes at short and long range (e.g., airborne). These particles can remain suspended and contagious in the air for up to two hours, depending on the number of air changes. The virus can also live on surfaces for up to two hours, therefore transmission of measles via fomites is also possible.

If the patient is suspected of measles prior to their arrival, schedule the patient visit for the end of the day to minimize exposure of others.
Screen patients upon arrival to your health care setting for symptoms of acute respiratory illness including rash. Sample Signage for Passive Screening from PHO's Best Practices for the Prevention of Acute Respiratory Infection Transmission in All Health Care Settings document.
Ensure the patient wears a medical mask (if no contraindications).
Place the patient in an appropriate room immediately upon arrival. A single room with negative air flow (airborne infection isolation room [AIIR]) with the door closed is preferred. If an AIIR is not available, the patient should be placed in a single room with the door closed.
Limit patient movement unless absolutely necessary. Use transport routes that minimize contact with others and clear all hallways and elevators along the route.
Only health care workers (HCWs) with at least two doses of measles-containing vaccine or laboratory evidence of immunity, regardless of year of birth, should provide care to patients with suspect/confirmed measles.
Measles can spread through airborne, droplet and contact transmission. Therefore, all individuals suspected of having a measles infection should be managed under airborne, droplet and contact precautions. All HCWs regardless of immunity to measles are to wear a fit-tested, seal-checked N95 respirator, eye protection, gown and gloves when providing care to a patient with suspect or confirmed measles.
After patient leaves, the door to the room where the patient was examined must remain closed with signage to indicate that the room is not to be used. Do not use the room for two hours to allow for sufficient time for the air to be free of respiratory particles.
Once sufficient time has elapsed, conduct routine cleaning and disinfection of the room and equipment. Be sure to follow the manufacturer's instructions for use of all cleaning and disinfection products, including adherence to the correct contact time.

For additional IPAC information see:

Public Health Ontario: Measles: Information for Health Care Providers; page 6-7
Public Health Ontario: Measles IPAC Checklist for Clinics and Specimen Collection Centres
Provincial Infectious Diseases Advisory Committee: Routine Practices and Additional Precautions In All Health Care Settings
Appendix N: Clinical Syndromes/Conditions with Required Level of Precautions

Laboratory Testing

Diagnostic laboratory testing is essential for all suspected measles cases. Measles PCR is the preferred testing method at this time. Measles PCR testing includes collecting a nasopharyngeal or throat swab AND a urine sample. Measles serology testing may provide additional diagnostic value; however, blood collection may cause additional health care visits and community exposures, therefore measles serology testing is not mandated at this time and is at the discretion of the ordering health care provider.

Ensure your office has specimen containers and supplies available for testing. Confirm the expiry dates on the specimen containers (e.g., swabs). Kits can be ordered from the Public Health Ontario Laboratory (PHOL).

Individuals who are tested for measles can be provided with the following resource: Measles Testing: A Quick Guide for Patients.

Post Exposure Prophylaxis

Post Exposure Prophylaxis (PEP) involves the timely administration of measles, mumps, and rubella (MMR) vaccine or immunoglobulin (Ig) to susceptible individuals following measles exposure. Immunoglobulin is generally administered in hospital settings. The goals of PEP are to lower the risk of infection and reduce the severity of illness if measles infection occurs.

For additional information see:

Public Health Ontario: AT A GLANCE Measles: Post-Exposure Prophylaxis for Contacts
Public Health Ontario: Recommendations: Measles Post-Exposure Prophylaxis for Individuals Who Are Immunocompromised

More Resources

Infectious Disease Protocol, Appendix 1: Measles

Last updated: June 5, 2025

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