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Measles returning in Canada may feel unreal, but the events of 2024–2025 showed that viruses don’t disappear simply because we assume they’re gone. The outbreak spread across multiple provinces, leading Canada to lose its measles-free status in late 2025. Thousands of cases were documented, including severe infections and infant deaths. These tragedies were preventable, highlighting the importance of vaccination and immunity maintenance.
Vaccine coverage is key. Rates had been slipping in certain regions, worsened by the COVID-19 pandemic. School closures, healthcare disruptions, and misinformation contributed to missed vaccinations. Measles requires extremely high coverage—around 95% with two MMR doses—to prevent outbreaks. Its contagiousness is unmatched: one infected person can spread it to 12–18 others, and the virus can linger in the air for hours.
Some viewed measles as “just a rash” or “something everyone got.” In reality, before vaccines, measles was a leading global killer. Complications include pneumonia, dehydration, encephalitis, blindness, hearing loss, long-term neurological damage, and SSPE—a fatal condition appearing years after infection. During Canada’s 2024–2025 outbreaks, infants too young for vaccination suffered preventable harm.
The MMR vaccine is one of the safest and most studied vaccines globally. Two doses provide about 97% protection. Vaccination not only protects individuals but also shields vulnerable populations such as infants, pregnant people, and immunocompromised individuals—creating herd immunity.
Canadian public health agencies responded with:
Rebuilding immunity requires:
Global trends also impact Canada, as measles outbreaks elsewhere can quickly spread via travel. Strengthened international coordination, outreach, and reliable vaccination systems are critical to prevent future outbreaks.
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