Local Case of Measles in Peterborough
Written by Comms Team, June 10, 2025
Health Unit Announces First Local Case in More Than a Decade
Today, Peterborough Public Health (PPH) is announcing the first case of locally acquired measles within the region in more than a decade. The resident is an adult who has been fully vaccinated (considered a “breakthrough case”), with the current source of the exposure unknown. Although rare, breakthrough cases can occur; they cause much less severe symptoms than cases in those who are unvaccinated.
A series of outbreaks have been affecting regions throughout Ontario over the last few months, with neighbouring Health Units reporting cases, but the disease had not been identified within Peterborough until now. Investigations are currently underway to determine potential exposure locations and affected individuals. Peterborough Public Health has identified the following known exposure locations:
*please note that additional time has been included in this information to reflect the potential for airborne transmission
If you believe you have been exposed at any of the dates and locations above:
- Check your vaccination record. Confirm that household members have received two (2) doses of the measles vaccination (MMR or MMRV). If you have 2 doses of measles vaccine, you are not considered susceptible.
- If you do not have two doses or are unsure, notify Peterborough Public Health. Please call 705-743-1000.
- Consider vulnerability and need for post-exposure care. If you were exposed AND are immunocompromised, unvaccinated, or pregnant, contact PPH at 705-743-1000 to assess eligibility and need for post-exposure care.
- Monitor for symptoms. Stay home if you develop any symptoms. Contact PPH (705-743-1000) and notify them that you may have measles. Always phone any clinic, emergency department, or health care setting before attending if you have been exposed or are experiencing symptoms.
Symptoms:
Measles is airborne and one of the most contagious viral diseases in the world; this is why even one case draws attention from public health. Symptoms begin 7-21 days after infection and may include:
- High fever (38.8°C or 101°F, or higher)
- Cough
- Runny nose
- Drowsiness
- Irritability
- Red, watery eyes
- Small white spots on the inside of the mouth and throat
- Red, blotchy rash (3-7 days after symptoms start), spreading across the body
Although most people who contract measles recover without treatment, it can be severe for those who are immunocompromised, including infants, pregnant people, and those with existing medical conditions. Possible complications can include ear infections, pneumonia, brain swelling, and even death.
Measles Vaccination Information:
Cases in fully vaccinated individuals are rare and known as “breakthrough” cases. “These cases are usually milder, less likely to require hospitalization, and occur in people who have close contact with a case over a longer period of time,” said Dr. Natalie Bocking, Deputy Medical Officer of Health. The vast majority of measles cases in the current provincial outbreak are in unvaccinated individuals – over 94%.
While the current risk to the public is low, PPH is reminding residents of the importance of ensuring that they are up to date with their vaccinations. “Measles vaccination really is the most effective tool we have to prevent measles cases and outbreaks,” said Dr. Thomas Piggott, Medical Officer of Health and Chief Executive Officer. “A full series will provide you with about 97% protection.” Residents are encouraged to check their vaccination status and call their health care provider if they are not up to date. Those without a health care provider can book an appointment at PPH’s Routine Immunization Clinic by calling 705-743-1000, ext. 331.
Children should receive one dose of MMR vaccine at one year of age. Then a second dose (of MMRV vaccine) between four and six years old – ideally before entry to school. Generally, adults born before 1970 are presumed to be immune to measles. Adults born in or after 1970 should have at least 1 dose of MMR vaccine. The following adults are eligible to receive a second dose for additional protection:
- Health care workers
- Post secondary students
- Travellers to areas where disease is of concern
- Other adults, based on health care provider’s clinical judgement
PPH is continuing to monitor the situation and will provide updates, as necessary. Learn more about measles and vaccination, including a video from Dr Thomas Piggott, at www.peterboroughpublichealth.ca/measles.
Did You Know We Merged?
As of January 1, 2025, the Haliburton, Kawartha, Pine Ridge District Health Unit and Peterborough Public Health merged to form the Haliburton Kawartha Northumberland Peterborough Public Health (legal name only).
Efforts are currently underway to develop an operational name and a brand identity. In the meantime, you will see logos and other marketing material from both legacy organizations. You may also see references and documents using the legal name Haliburton Kawartha Northumberland Peterborough Public Health.
Partners and members of the public should continue to engage with their local public health offices as usual until otherwise directed.
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For further information, please contact:
Media Relations
media@peterboroughpublichealth.ca