Vaccination, immunity and information: Your questions on measles, answered

Canada continues to see an alarming rise in measles instances in 2025.

Via the spring, the virus unfold most intensely in Ontario. However after over 2,200 instances, a whole bunch hospitalized and one measles-related dying, it appears to be dwindling in that province.

Now, Alberta’s seeing a spike, with nearly 1,300 confirmed instances to date. 

With each province besides Newfoundland and Labrador reporting instances of measles, listed below are some frequent questions from CBC readers, viewers and listeners — answered. 

I’ve had measles as a baby. Am I protected from getting contaminated once more? 

Probably sure, says the Public Well being Company of Canada (PHAC).  

It says those that have had a previous measles an infection must be immune in opposition to one other one, so long as they’ve a standard immune response. 

I’ve misplaced my vaccination information. Ought to I get one other dose?

Typically, sure, says PHAC.

PHAC recommends that kids and adults who do not have information of their vaccination historical past be began on an immunization schedule acceptable to their age and threat elements.

Even for those who’ve already been vaccinated, it is usually thought of protected for health-care suppliers to offer one other dose, PHAC says, as a result of they have not seen extra unwanted effects from repeated immunization. 

However for this reason a nationwide vaccine registry can be vastly useful, says Daybreak Bowdish, a professor of immunology at McMaster College. 

“The quantity of people that wish to work out in the event that they received one dose, in the event that they received two doses, in the event that they had been vaccinated as kids and maybe they simply moved provinces they usually cannot get their information is extraordinarily excessive.”