As measles cases rise in Mexico, including in Jalisco – a host city for the upcoming World Cup – many are questioning the significance of a common mark left on the arms of millions: a small, circular scar. Contrary to popular belief, this scar isn’t typically from the measles vaccine, but rather from a different, crucial immunization administered shortly after birth. Understanding which vaccine leaves this mark, and ensuring up-to-date measles protection, is vital as public health officials address the current outbreak.
The resurgence of measles, a highly contagious and potentially serious disease, has prompted a review of vaccination records across the country. While the measles vaccine is administered as part of the triple viral (SRP) vaccine – protecting against measles, rubella, and mumps – the scar often mistaken for its mark actually comes from the Bacillus Calmette-Guérin (BCG) vaccine. This vaccine provides protection against severe forms of tuberculosis, including tuberculous meningitis, and is a cornerstone of Mexico’s national vaccination program, given to newborns according to the Secretaría de Salud’s vaccination schedule.
What is the BCG Vaccine and Why Does it Leave a Scar?
Tuberculosis remains a significant global health threat, responsible for over a million deaths annually, according to health authorities. The BCG vaccine, administered intradermally – into the skin – on the upper arm, creates a small lesion that typically heals, leaving a permanent scar. This scar serves as a visual indicator that the body has developed an immunological response to the vaccine. However, experts caution that the absence of a scar doesn’t necessarily mean a person isn’t protected, but it does warrant a review of their vaccination records.
Confirming Measles Vaccination Status
The measles vaccine is delivered through the triple viral (SRP) vaccine, which likewise safeguards against rubella and mumps. Typically, the first dose is administered at one year of age, with a booster dose given at six years old. Individuals unsure of their vaccination status should check their national health card, consult with their parents, or visit a medical center for confirmation. The measles vaccine is also available for adults who did not complete their vaccination schedule.
Who Should Get Vaccinated Against Measles in 2026?
In 2026, the Secretaría de Salud is recommending that individuals verify their vaccination status, with a particular focus on:
- Children aged 18 months, for their second dose of the SRP vaccine.
- Children between 6 and 11 months residing in areas experiencing active measles outbreaks.
- Individuals under 49 years of age who lack a complete vaccination record or do not recall having been vaccinated.
Vaccination modules are available throughout Mexico City, and individuals can find the nearest location using this link.
The recent measles outbreak, with nearly 30 deaths reported in Mexico, underscores the importance of preventative measures. Maintaining high vaccination coverage remains the most effective strategy to control the spread of this highly contagious disease.
As health authorities continue to monitor the situation and implement vaccination campaigns, staying informed about your vaccination status and seeking guidance from healthcare professionals is crucial. The ongoing efforts to combat measles highlight the importance of public health infrastructure and the collective responsibility to protect vulnerable populations.
Disclaimer: This information is intended for general knowledge and informational purposes only, and does not constitute medical advice. This proves essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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