Undernutrition Weakens Measles Vaccine Protection in Children, Study Reveals

Undernutrition Linked to Weakened Measles Vaccine Protection, Study Finds

As measles cases surge globally, new research highlights a concerning connection between undernutrition and weakened vaccine protection, particularly in regions grappling with food insecurity. A study involving more than 600 fully vaccinated children in South Africa reveals that those who were undernourished had significantly lower levels of measles antibodies compared to their well-nourished peers.

The research, conducted by a team from McGill University, the University of California, Berkeley School of Public Health, and the University of Pretoria, tracked children’s growth as an indicator of undernutrition and measured their antibody levels through blood tests. The findings, published in Vaccine, show that children who were stunted at age three had, on average, 24% lower measles antibody levels by age five than children of typical size.

This suggests that undernutrition may reduce the duration of vaccine protection, raising concerns about its role in fueling outbreaks.

“Addressing child hunger could be a critical step in preventing viral outbreaks,” said Jonathan Chevrier, senior author of the study and an associate professor at McGill University. “Ensuring children are well-nourished is just as important as ensuring they are vaccinated.”

Measles, a highly contagious viral infection, causes symptoms such as fever, rash, and cough and can lead to severe complications, particularly in young children. Despite being preventable through vaccination, the disease is resurging in regions where it was once under control, including Canada, which reported its highest number of cases in nearly a decade in 2024.

Global measles cases declined steadily from 2000 to 2016, but the trend reversed in 2018, driven in part by under-vaccination and the lingering effects of the COVID-19 pandemic. Today, measles is making a strong comeback in many parts of the world, even in areas where vaccination programs are robust.

“We need to vaccinate children against preventable infectious diseases and ensure they are protected,” said Brenda Eskenazi, lead author of the study and professor emerita of public health at UC Berkeley. “This is especially urgent now, as climate change is expected to exacerbate the spread of many known diseases.”

Globally, approximately 148 million children under age five—about 22%—were stunted in 2022, with the highest rates in Asia and sub-Saharan Africa. These regions are also among the most vulnerable to measles outbreaks, underscoring the need for integrated approaches to combat both undernutrition and infectious diseases.

The research team plans to continue monitoring the children in the study as they grow older to determine whether the effects of early-life undernutrition persist into adolescence and adulthood.

The study was funded by the U.S. National Institute of Environmental Health Sciences and the Canadian Institutes of Health Research.

The findings of this study ⁢underscore a critical and ‍often overlooked dimension of global health: ‍the interplay between nutrition ⁢and vaccine efficacy. As measles cases continue to rise worldwide,particularly in regions burdened by ​food​ insecurity,the research⁤ highlights how undernutrition‌ can ⁤undermine the protective benefits of vaccination,leaving ‌vulnerable populations at greater risk.⁢ this revelation ⁣calls for a more integrated approach⁣ to public‌ health, one that addresses both immunization and⁤ nutritional support as complementary ⁤strategies in the fight against preventable⁢ diseases. Policymakers, healthcare providers, and international organizations⁤ must prioritize interventions⁤ that ensure children not only receive vaccines‌ but ‍also have access to adequate nutrition to maximize their immune response. By tackling the dual challenges of‌ undernutrition and vaccine-preventable ⁢diseases, we can move closer to achieving global ⁢health equity and safeguarding the well-being of future generations.
number of measles cases in decades in 2023. The study’s findings underscore the urgent need to address undernutrition as a critical factor in maintaining vaccine efficacy adn preventing outbreaks.

As global health organizations work to combat measles and other vaccine-preventable diseases, this research highlights the importance of a holistic approach to public health. Vaccination campaigns must be complemented by efforts to improve nutrition, particularly in vulnerable populations. By tackling undernutrition,we can strengthen immune responses,extend the duration of vaccine protection,and ultimately reduce the risk of deadly outbreaks.

The study serves as a stark reminder that health interventions cannot operate in isolation. Combating measles and other infectious diseases requires addressing the root causes of vulnerability, including food insecurity and poverty. Policymakers, healthcare providers, and international organizations must prioritize integrated strategies that ensure children are both well-nourished and fully vaccinated. Only then can we hope to achieve lasting protection against preventable diseases and safeguard the health of future generations.