The Return of Measles: Why Vaccination Rates Are Dropping

Measles was officially eliminated in the United States back in 2000. Today, we are seeing dangerous outbreaks of this highly contagious virus in cities across the globe. Understanding why vaccination rates are falling is the first step to protecting our communities from a disease we once defeated.

A Disease We Thought We Defeated

In the year 2000, public health officials celebrated a massive victory. Measles was declared eliminated in the US. This meant the disease was no longer constantly spreading within the country. The success was entirely due to the widespread distribution of the highly effective MMR vaccine, which protects against measles, mumps, and rubella.

Measles is one of the most contagious viruses on the planet. The Centers for Disease Control and Prevention (CDC) notes that if one person has it, up to 90% of the people close to that person who are not immune will also become infected. The virus lives in the nose and throat mucus of an infected person and can linger in the air for up to two hours after that person has coughed or sneezed. Because it is so contagious, a community requires extremely high vaccination rates to keep the virus out.

The Data Behind the Drop

To achieve what scientists call “herd immunity” against measles, about 95% of a population must be fully vaccinated. Herd immunity creates a protective wall that stops the virus from reaching vulnerable individuals, such as newborn babies who are too young for the vaccine or cancer patients with weakened immune systems.

Unfortunately, that protective wall is currently crumbling. According to the CDC, routine childhood vaccination rates among US kindergarteners have dropped below the critical 95% threshold. During the 2022 to 2023 school year, the national vaccination rate for the MMR vaccine fell to 93.1%. While a drop of less than two percentage points might sound small, it leaves hundreds of thousands of children completely unprotected.

This decline is already having real-world consequences. The World Health Organization (WHO) reported a staggering 79% increase in global measles cases in 2023 compared to the previous year. The US has felt this wave directly. In early 2024, public health departments managed active measles outbreaks in Florida, Philadelphia, and a migrant shelter in Chicago.

Why Are Parents Hesitant?

The resurgence of eradicated diseases is directly linked to modern vaccine hesitancy. Several specific factors have combined to drive vaccination rates down over the past few years.

• Pandemic Disruptions: The COVID-19 pandemic caused millions of families to miss routine wellness visits. Pediatricians saw a sharp decline in well-child checkups in 2020 and 2021. Many children simply missed their scheduled MMR doses and never caught up.
• Persistent Misinformation: The modern anti-vaccine movement gained massive traction in 1998 when Andrew Wakefield published a paper in The Lancet claiming a link between the MMR vaccine and autism. Although the study was later proven to be entirely fraudulent and The Lancet retracted it, the myth still thrives on social media platforms like Facebook and TikTok.
• Erosion of Institutional Trust: The highly politicized environment surrounding the COVID-19 vaccines spilled over into routine childhood immunizations. Many parents developed a general skepticism toward public health agencies like the FDA and CDC, as well as pharmaceutical manufacturers.
• Rising Exemption Rates: All 50 states require specific vaccines for students entering public school. However, 45 states allow exemptions based on religious beliefs, and 15 states allow exemptions for personal or philosophical reasons. States like Idaho and Utah have seen significant spikes in parents filing these non-medical exemptions over the last three years.

The True Danger of a Measles Infection

Vaccine hesitancy often stems from the false belief that measles is just a harmless childhood rash. Before the measles vaccine became available in 1963, the virus infected an estimated 3 to 4 million Americans every year. Of those, roughly 48,000 were hospitalized and 400 to 500 died annually.

Measles can lead to severe health complications. About one in five unvaccinated people who get measles in the US will be hospitalized. The most common cause of death from measles in young children is pneumonia. The virus can also cause encephalitis (swelling of the brain), which can result in permanent deafness or intellectual disabilities.

Furthermore, scientists have discovered that measles causes a terrifying condition known as “immune amnesia.” The measles virus infects and destroys the very white blood cells that remember how to fight off other illnesses. A child who survives measles can lose their acquired immunity to other diseases like the flu or RSV, leaving them highly vulnerable to secondary infections for up to three years.

Rebuilding Our Immunity

Public health experts agree that raising vaccination rates is the only way to stop the current outbreaks. The MMR vaccine is incredibly effective. Two doses are 97% effective at preventing measles, while a single dose is 93% effective.

Parents who are unsure about their child’s vaccination status should contact their pediatrician to request a copy of their immunization records. The CDC recommends the first dose of the MMR vaccine at 12 to 15 months of age, and the second dose at 4 to 6 years of age. Older children and adults who missed these doses can still get catch-up vaccinations. Rebuilding our herd immunity requires a collective effort, starting with accurate information and a commitment to routine medical care.

Frequently Asked Questions

At what age should children get the measles vaccine? The CDC recommends that children get two doses of the MMR vaccine. The first dose should be given between 12 and 15 months of age. The second dose is typically given between 4 and 6 years of age before the child enters kindergarten.

Can vaccinated people still get measles? It is extremely rare. Two doses of the MMR vaccine provide 97% protection against measles. If a fully vaccinated person does happen to contract the virus, their symptoms are generally very mild, and they are much less likely to spread the disease to others.

Is the MMR vaccine safe? Yes. The MMR vaccine has a highly proven safety record stretching back decades. Extensive global research has repeatedly confirmed that the vaccine is safe, effective, and has no connection to autism. Most side effects are minor, such as a sore arm or a low-grade fever.

How does measles spread? Measles is an airborne virus. It spreads when an infected person coughs or sneezes. The virus can survive in the airspace where the infected person was coughing for up to two hours. You can contract measles simply by breathing the contaminated air or touching an infected surface and then touching your eyes, nose, or mouth.