Should you get another measles shot? What to know as cases surge

The Resurgence of Measles in Canada: A Call to Action for Adults

Introduction: The Rise of Measles Cases in Canada

Canada is witnessing a concerning surge in measles cases, prompting many adults to reflect on their immunity status. Whether through past infections or vaccinations, the question of whether their protection remains robust is paramount. Measles outbreaks, though once controlled, have resurfaced, underscoring the need for vigilance and proactive health measures. This resurgence serves as a critical reminder of the importance of understanding and ensuring up-to-date vaccination status, especially in light of increasing travel-related exposures.

Understanding Vaccination History and Immunity Over Time

Canada’s vaccination program has evolved significantly since the introduction of the measles vaccine in 1963. Routine childhood immunization began in 1970, initially with a single dose, and a second dose was added in 1996. Adults born after 1970 might have received only one dose, potentially leaving their immunity weakened over time. Dr. Isaac Bogoch highlights that individuals born in the early 1970s may not have the same level of protection, emphasizing the recommendation for a second dose for those traveling to high-risk areas. This historical context underscores the varying levels of immunity across different age groups and the importance of re-evaluating vaccination status.

The Contagious Nature of Measles and Current Outbreaks

Measles is highly contagious, more so than COVID-19 or influenza, and can linger in the air, infecting individuals unknowingly. Dr. Theresa Tam warns of its airborne transmission, even after an infected person has left a room. With 95 cases reported as of February 2023, outbreaks in British Columbia, Manitoba, Ontario, and Quebec highlight the vulnerability in areas with lower vaccination rates. This contagiousness, coupled with global outbreaks, makes measles a significant public health concern, particularly during peak travel times like March break.

Vaccine Efficacy and Current Recommendations

The measles vaccine, administered as MMR or MMRV, offers 85-95% efficacy with one dose, rising to nearly 100% with two doses. Public Health Agency of Canada (PHAC) recommends a two-dose schedule for those born after 1970, crucial for maintaining community immunity. Sabina Vohra-Miller advocates for consulting healthcare providers, especially for travelers, and emphasizes the safety and effectiveness of additional doses. Understanding these recommendations can guide individuals in making informed decisions about their health and vaccination needs.

Special Considerations for Travelers and High-Risk Groups

For travelers, particularly during March break, ensuring up-to-date measles vaccination is essential. High-risk areas require careful consideration of vaccination status.Certain groups, such as healthcare workers, travelers, and military personnel, may need additional doses regardless of birth year. PHAC’s tailored recommendations for different demographics aim to optimize protection and prevent outbreaks, especially in high-exposure settings.

Conclusion and Call to Action

As measles cases rise, it’s crucial for Canadians to assess their vaccination status and consider additional doses if necessary. While a third booster isn’t currently recommended, ensuring two doses is vital. Measles symptoms are milder in vaccinated individuals, who are also less likely to transmit the virus. Proactive measures, including consulting healthcare providers, can mitigate risks. Staying informed and taking appropriate actions is key to safeguarding individual and community health."

This structured approach addresses the concerns and provides clear, actionable guidance, ensuring readers are well-informed and motivated to protect themselves and their communities.