Measles Cases on the Rise in Canada

As measles cases skyrocket in Canada, particularly in Ontario, travelers from the United States are being urged to take precautionary measures. The New York State Department of Health recently issued a travel advisory, emphasizing the urgent need for vigilance as the spring break approaches.

"Measles is a highly contagious virus that can easily cross borders," the department warned, highlighting that 90% of unvaccinated individuals exposed to the virus are likely to contract it. With travel on the rise as families head out for spring and summer vacations, unprotected travelers could become infected and unknowingly spread the disease upon their return home.

Current Outbreak in Ontario

Reports indicate that Canada is currently experiencing a significant measles outbreak, which began in October 2022 following a travel-related case in New Brunswick. Although New Brunswick declared its outbreak over in January, Ontario has become the epicenter, with a staggering 655 measles cases reported as of April 2, 2025. This number includes 560 confirmed cases and 95 probable ones, a concerning spike comparing to the meager 101 confirmed cases recorded across the entire previous decade from 2013 to 2023. The situation that has developed in Ontario underscores the challenges that public health officials are facing as they work to contain the virus.

Global Surge in Measles Cases

In addition to the alarming situation in Canada, cases of measles are surging in various countries worldwide, such as Yemen, Pakistan, India, Thailand, Ethiopia, Romania, Afghanistan, Indonesia, Kyrgyzstan, and Vietnam. This global trend poses a potential risk not only for travelers but for communities that may have low vaccination coverage.

Understanding Measles Transmissibility

Measles is recognized as one of the most contagious infectious diseases known, surpassing illnesses like COVID-19, influenza, and chickenpox in its transmissibility, which is a key reason why outbreaks can escalate rapidly, particularly in populations with low immunization rates.

Vaccination Recommendations for Travelers

To safeguard against this outbreak, health officials recommend getting vaccinated. In Canada, the measles vaccine is typically administered in two forms: the measles-mumps-rubella (MMR) vaccine or an additional varicella component (MMRV). The first dose, usually given to children at 12 or 15 months old, is estimated to be 85 to 95% effective, while receiving a second dose further enhances protection to nearly 100%.

Advice for Spring Travelers

As spring break looms, travelers are urged to check their vaccination status and consult with healthcare professionals before embarking on their journeys, ensuring they remain safe from potential exposure to measles and protect their communities upon their return. Stay informed, stay vaccinated, and keep yourself and your loved ones safe this travel season!