A drop in vaccine rates not only in Ontario, but across the country, has contributed to a resurgence of the measles virus, which was once considered eradicated.
Since Friday, March 21 there have two lab-confirmed cases reported in Lambton County.
Lambton Medical Officer of Health Dr. Karalyn Dueck told local media during a news conference on Tuesday that the two cases are not connected. To protect their privacy, the ages of those involved were not released.
Dr. Dueck did not confirm where the initial exposures are believed to have occurred.
She said more cases in the coming days and weeks are possible.
"I think we could see further measles cases," said Dueck. "However, according to the Canadian Immunization Guide and Health Canada, even one dose of vaccine is estimated to be 85 per cent to 90 per cent protection. And with a second dose, that protection approaches 100 per cent."
Dr. Dueck said the local vaccination rate is above the provincial average.
"We do have very good coverage for childhood immunization rates for measles," she said. "According to Public Health Ontario's 2023-2024 year school data, Lambton has measles coverage rates for vaccines of 90 per cent for seven year olds, and 96.5 per cent for 17 year olds."
Several areas of concern in Ontario have been identified by the Ministry of Health.
"These are Southwestern Public Health region, that's Oxford and Elgin counties, and Grand Erie Public Health region," said Dr. Dueck. "Huron-Perth Public Health region, which is our neighbor, is also considered an area of concern and they've noted that anyone living, working or travelling through these areas is at higher risk of measles exposure."
Lambton Public Health (LPH) has launched an online screening tool to help answer any questions people might have, if they believe they've been exposed to the virus.
LPH also has a dedicated vaccine call centre set up that can be reached at 226-254-8222.
Dr. Dueck says those who are most at risk for severe complications from measles are the very young.
"So any infant who is less than 12 months of age, who does not yet have the opportunity routinely through Ontario's publicly funded immunization schedule, they're most at risk for severe complications that could include pneumonia, hearing loss, encephalitis, and seizures," she said.
If you believe you've been exposed to the virus, you're urged to monitor for symptoms which can appear up to 21 days later.
Symptoms include fever, rash, red eyes, coughing and runny nose.
LPH said if you develop symptoms, contact your health care provider, avoid public spaces and self-isolate at home.