Measles: A Growing Concern Due to Declining Vaccination Rates
Measles, once a historical reference, has resurfaced as an ongoing public health concern since 2025 in various countries, including Mexico. This resurgence is not due to virus mutation but rather a widely recognized factor by experts: the decline in vaccination coverage.
Severe Complications
Dr. Juan Camilo Lozano warns that measles can cause severe complications, especially in young children and individuals with weakened immune systems. These complications include severe pneumonia, neurological impairments requiring hospitalization, and potentially permanent consequences.
- Pneumonia: A leading cause of hospitalization and mortality associated with measles.
- Encephalitis: Inflammation of the brain that can result in permanent neurological damage.
- Severe diarrhea: Can cause severe dehydration, particularly in young children.
- Ear infections: Can lead to hearing loss.
- Secondary respiratory infections: Due to weakened immune systems.
Beyond immediate complications, Dr. Lozano highlights an often-overlooked impact: the effect of measles on the immune system. The infection can weaken the body’s ability to respond to other pathogens, leaving individuals more vulnerable even after recovering from the acute phase.
The World Health Organization (WHO) has cautioned that measles remains one of the leading causes of preventable mortality globally through vaccination. When immunization coverage drops below the recommended threshold, the virus quickly regains its propagation capacity, even in countries that had previously controlled the disease.
To prevent outbreaks, WHO recommends that at least 95% of the population have a complete triple viral vaccination (measles, rubella, and mumps). This coverage level is crucial for generating herd immunity, a vital mechanism to protect those who cannot be vaccinated, such as infants under one year old or individuals with certain medical conditions.
Dr. Lozano agrees with this approach, emphasizing that vaccination is not just an individual decision but a collective responsibility. He views measles as a clear example of what happens when prevention efforts weaken and medical follow-up is lost.
Key Questions and Answers
- What are the severe complications of measles? Severe complications include pneumonia, encephalitis, severe diarrhea, ear infections, and secondary respiratory infections.
- Why has measles resurfaced in recent years? The resurgence is primarily due to declining vaccination rates, not virus mutations.
- What percentage of the population needs to be vaccinated to prevent outbreaks? At least 95% of the population should have a complete triple viral vaccination to generate herd immunity.
- Why is herd immunity important? Herd imunity protects those who cannot be vaccinated, such as infants and individuals with certain medical conditions.
- What is the role of vaccination in preventing measles? Vaccination is a crucial, cost-effective strategy to avoid hospitalizations, complications, and deaths.
