He measles outbreak in Mexico caused many people to wonder what is the vaccine leaves a mark on left arm. Many Mexicans believe that it is the measles vaccinebut it is not like that.
The round scar that millions have had since childhood corresponds to another key immunization in the national scheme. In DNA Newswe explain what it is, why it leaves “mark” and what you should know about the rebound in measles cases in 2026.
How to locate your measles vaccination center online
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What is the vaccine that leaves a scar on the arm?
The vaccine that leaves a scar on the left arm is the BCGwhich protects against severe forms of tuberculosissuch as tuberculous meningitis. In Mexico it applies to newbornsin accordance with the vaccination scheme of the Ministry of Health. Tuberculosis is a deadly infectious disease which claims the lives of more than a million people a year, remaining one of the main causes of infectious death worldwide.
The BCG vaccine It is placed on the upper part of the arm and generates a small lesion that evolves to form a permanent scar. That mark indicates that the body developed an immune response.
Specialists explain that not having a scar does not always mean that the person is not protected, but it can be a sign to check the vaccination record. The important thing is that this vaccine is not the measles vaccine.
How do I know if I have the measles vaccine?
The measles vaccine is part of the triple viral (SRP), which also protects against rubella and mumps. It is generally applied at one year of age and a booster at six years of age.
If you have doubts, check your national health card, ask your mother or father or go to a medical center to confirm. It is important that you know that the measles vaccine in adults It is also available to those who did not complete their scheme.
Who should get vaccinated against measles in 2026?
In 2026, the Ministry of Health recommended checking complete schematics, especially in:
- Girls and boys 18 months old, for the second dose of SRP
- Children from 6 to 11 months who live in areas with active outbreaks
- People under 49 years of age who do not have a complete schedule or do not remember having been vaccinated
If this is your case, go to the vaccination modules that are located in Mexico City. You can find the one closest to your home in this LINK.
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