Measles: What You Need to Know

March 31, 2025

Measles: What You Need to Know 

We understand that news about measles cases in the community can be concerning. While it's important to be aware, we want to reassure our patients that the risk remains low for most individuals—especially those who have received two doses of the MMR (measles, mumps, rubella) vaccine.

If you are feeling unwell or believe you may have been exposed to measles, here’s what you need to know. 

What Is Measles?

Measles is a highly contagious viral illness that spreads through the air and can linger in the environment for up to two hours after an infected person leaves the space. Symptoms typically include:

• Fever (38.3°C or higher)
• Cough, runny nose, or red eyes
• A rash that starts on the face and spreads downward, usually appearing 3–7 days after other symptoms begin 

What to Do If You Think You Have Measles or Were Exposed

If you have:

• A fever and at least one of the following: cough, runny nose, or red eyes, and a rash, or
• Been in contact with someone diagnosed with measles in the last 21 days

Please do not come directly into the hospital or clinic. Instead:

1. Call ahead to your healthcare provider or our hospital at 705-435-3377 ext 0.
2. Follow instructions on how to enter safely, if needed. We will ask you to stay outside or in your vehicle until we are ready to see you safely.
3. If urgent care is required, we will make special arrangements to reduce the risk to others.

If You’re Not Vaccinated or Unsure of Your Immunity

Most people born after 1970 should have received two doses of the MMR vaccine. If you’re unsure about your vaccination status, speak to your healthcare provider or local public health unit. 

Protecting Yourself and Others

• The MMR vaccine is the best protection against measles.
• If you're visiting the hospital, only those with known immunity should accompany patients suspected of having measles.
• Staff and visitors should follow instructions from healthcare professionals regarding masks and movement within the facility.

Questions or Concerns?

Please contact the Simcoe Muskoka District Health Unit or Public Health Ontario for more information, to report possible exposure, and for the most up-to-date information.