A recent study by Public Health Ontario shows that many vaccinated adults may still be at risk for diseases like measles and whooping cough.
Health Canada has also updated their Measles Immunization Guide to say that some people did not receive optimal doses of the measles vaccine and are therefore at risk.
Those most at risk for contracting measles despite vaccination are people born between 1970 and 1996.
TL;DR Public Health Ontario and the Canadian Government have stated that some adults are at-risk of contracting diseases like whooping cough and measles.
The study by Public Health Ontario concludes that, in the case of whooping cough, "VE (vaccine effectiveness) is high during the first decade of life but then falls rapidly. Protection is not fully restored by the teenage booster."
The Government of Canada has also updated its recommendations for the measles and rubella vaccine.
Their page now states that "the concentrations of anti-measles antibodies in human Ig products have shown trends of gradually declining and are no longer considered optimally protective using the previously recommended dosing strategies."
Before 1996, it was only recommended that patients get one dose of the MMR vaccine. This single dose was effective in 95% of cases, but still left 5% of the population vulnerable.
Getting two doses of the vaccine raised the immunity rate to 99%. People born before 1970 are considered to be "naturally immune" against measles.
If you only received one dose of the vaccine, consider getting a booster shot.
This news comes as a measles outbreak continues to spread in North America.
Last month, the Chief Public Health Officer of Canada stated that she is "very concerned to see vaccine-preventable diseases, particularly those as serious and highly contagious as measles, making a comeback in Canada and around the globe. From my perspective, even one child dying of measles is unacceptable."
Stay tuned for more news about the ongoing mealses outbreak.
The best way to prevent a measles infection is to make sure you're vaccinated.