
Measles, Vitamin A, and Immune Health: What You Need to Know
A recent confirmed case of measles at Dulles Airport has raised concerns among patients about how to protect themselves and their families. While measles is less common in the U.S. due to high vaccination rates, it can still spread in certain populations, particularly among unvaccinated individuals or those with weakened immunity.
Vaccination is undoubtedly a highly charged topic right now. This post isn’t here to dive into that debate. Instead, it’s intended to focus on the current evidence regarding immune support—specifically the role of vitamin A in measles outcomes—as several patients have reached out with questions in this area. My goal is to offer clarity, not controversy, and to highlight practical, well-supported steps you can take to support your health.
One critical factor in measles severity is vitamin A status. The World Health Organization (WHO) and the CDC recommend high-dose vitamin A supplementation in measles cases to help reduce complications and mortality, particularly in children. But what does this mean for people in the U.S., where vitamin A deficiency is considered uncommon? Let’s break it down.
Measles and Its Risks
Measles is a highly contagious viral illness that spreads through respiratory droplets and can remain airborne for up to two hours (CDC). Symptoms typically include:
- High fever
- Cough and runny nose
- Red rash spreading from the face downward
While many people recover, complications can be serious, ranging from mild (ear infections, diarrhea) to severe (pneumonia, encephalitis, blindness, and even death) (WHO). Vitamin A supplementation has been shown to reduce the severity and mortality of measles, especially in children with vitamin A deficiency (CDC).
Vaccination Rates in the DMV Area
High vaccination rates are critical in preventing outbreaks. The MMR vaccine (measles, mumps, rubella) is typically administered in two doses during childhood. According to the CDC’s National Center for Health Statistics:
- The national MMR vaccination coverage for children aged 19-35 months is around 90%.
- Virginia and Maryland have vaccination rates close to this average.
- Washington, D.C. has made significant efforts to maintain high coverage among school-aged children.
While these rates are relatively high, measles outbreaks still occur when unvaccinated individuals introduce the virus into a community, as seen in past U.S. measles outbreaks.
Historic Measles Outbreaks in the U.S.
Although measles was declared eliminated in 2000, outbreaks continue due to declining vaccination rates in certain communities and travel-related cases (CDC).
- The most notable outbreak in recent years occurred in 2019, with over 1,200 cases, primarily affecting unvaccinated populations (CDC).
- The current case at Dulles Airport serves as a reminder that measles can still spread even in highly vaccinated areas if exposure occurs.
Vitamin A and Measles: Why Is It Recommended?
Vitamin A plays a crucial role in immune function, reducing complications, and lowering mortality rates in measles infections.
How Does Vitamin A Help?
- Supports Immune Function – Essential for T-cell function, antibody production, and maintaining epithelial barriers, helping the body fight infections (NIH).
- Reduces Severity and Complications – Lowers the risk of pneumonia, diarrhea, and eye damage associated with measles (WHO).
- Lowers Mortality Rates – Significantly reduces measles-related deaths, particularly in malnourished children (American Journal of Clinical Nutrition).
- Prevents Measles-Associated Blindness – Deficiency increases the risk of keratomalacia (severe eye damage) in measles (WHO).
- Shortens Disease Duration – Some studies suggest vitamin A reduces hospital stay and speeds recovery from measles (SagePub).
WHO Guidelines for Measles Cases
🔹 Children over 12 months: 200,000 IU of vitamin A for two consecutive days
🔹 Infants (6-12 months): 100,000 IU over two days
🔹 If eye involvement or vitamin A deficiency is present, an additional dose is given 2–4 weeks later (WHO).
Vitamin A Deficiency in the U.S.: Who Is at Risk?
While severe vitamin A deficiency is said to be rare in the U.S., marginal or subclinical deficiency is more common than many realize. Up to 45% of the US Population were found to have marginal vitamin A levels based on reanalysis of 2005–2016 National Health and Nutrition Examination Surveys (NHANES) (Nutrients). In my clinical experience, I frequently see low vitamin A levels in patients with gut health issues and poor dietary intake.
Populations at Higher Risk
- People with fat malabsorption disorders – Those with celiac disease, Crohn’s disease, small intestinal bacterial overgrowth (SIBO), or liver disease often struggle to absorb fat-soluble vitamins like vitamin A (National Library of Medicine StatPearls).
- Individuals with low dietary intake – Those who eat low-fat, low-animal-product, or highly processed diets may not get enough vitamin A or its precursor, beta-carotene.
- People who struggle to convert beta-carotene to vitamin A – Some individuals, due to genetic variations (like BCMO1 mutations), have trouble converting beta-carotene from plant foods into active vitamin A (retinol) (Front Nutr).
- Those who wear glasses or have poor night vision – Vitamin A is essential for eye health, and some patients who require glasses or have night vision issues may have higher vitamin A needs.
Should You Supplement with Vitamin A?
While vitamin A is critical for immune function, vision, and overall health, high doses should not be taken without medical guidance (NIH).
Would you like guidance on how to assess your vitamin A status or the best food-based sources for your needs? Reach out for a consultation!
Dr. Sarah Giardenelli is a naturopathic doctor, acupuncturist, principle clinician and founder of Collective Health Center based in Leesburg, Virginia, with a deep passion for helping individuals and families build lasting health through thoughtful, evidence-informed care. In her practice, she emphasizes immune resilience, nutritional foundations—including the role of key nutrients like vitamin A—and personalized strategies tailored to each patient. Dr. Giardenelli approaches healthcare with curiosity and discernment, steering clear of dogma from any side of a debate. She is committed to critical thinking, careful evaluation of the research, and empowering her patients to make confident, informed decisions about their health.