Measles Vaccine: When Do Kids Get It? (CDC Schedule Inside)

The measles vaccine, administered as part of the MMR (measles, mumps, rubella) shot, is a highly effective two-dose series. The CDC recommends the first dose for children at 12-15 months of age and the second dose at 4-6 years. This schedule provides approximately 97% protection against measles, a disease that is currently resurging in the US and globally due to declining vaccination rates.

What Is the Measles Vaccine and When Do Kids Get It?

The measles vaccine is a live attenuated virus vaccine, almost always given as the combination MMR shot. The CDC’s standard childhood immunization schedule mandates the first dose at 12-15 months and the second dose at 4-6 years. Infants as young as 6 months may receive an early dose if they are traveling internationally or living in an area with an active outbreak, but they will still need the full two-dose series later for lasting protection.

Why Is the MMR Vaccine Given in Two Doses?

A single dose of the MMR vaccine is about 93% effective at preventing measles, according to the CDC’s 2023 immunization guidelines. The second dose, given years later, acts as a booster, raising effectiveness to approximately 97%. This two-dose strategy is designed to catch the small percentage of children who do not mount a sufficient immune response to the first dose and to ensure community immunity (herd immunity) is maintained.

The MMR Vaccine Schedule: A Detailed Breakdown

The timing of the MMR vaccine is critical for protecting children during their most vulnerable years. The schedule is designed to balance the waning of maternal antibodies with the need for early protection.

Age	Recommended Dose	Key Details
6-11 months	Early dose (if needed)	Only for international travel or outbreak exposure. Child must still receive the routine two-dose series later.
12-15 months	First routine dose	The standard starting point for most children.
4-6 years	Second routine dose	Given before kindergarten entry. Can be given as early as 28 days after the first dose if needed.
Catch-up (7-18 years)	Two doses, 28 days apart	For children and adolescents who missed the standard schedule.

What About the MMRV Vaccine?

A combination vaccine called MMRV (measles, mumps, rubella, and varicella) is also available. The CDC’s Advisory Committee on Immunization Practices (ACIP) notes that MMRV is associated with a slightly higher risk of fever and febrile seizures in children 12-23 months old compared to separate MMR and varicella shots. For this reason, the CDC generally prefers the MMR and varicella vaccines be given separately for the first dose in this age group.

How Effective Is the Measles Vaccine?

The MMR vaccine is one of the most effective vaccines in modern medicine. According to the World Health Organization’s 2024 global measles report, two doses of the vaccine are 97% effective against measles and 88% effective against mumps. The vaccine’s high effectiveness is the primary reason measles was declared eliminated in the United States in 2000. However, the CDC’s 2025 data shows that national vaccination coverage among kindergarteners has fallen below the 95% threshold needed for herd immunity, directly contributing to the current resurgence.

What Are the Side Effects of the MMR Vaccine?

The MMR vaccine has a well-established safety profile. Common, mild side effects include a fever (in 5-15% of recipients, per the CDC) and a mild rash (in about 5%). These typically appear 7-12 days after vaccination. A more significant but rare side effect is a febrile seizure, which occurs in about 1 in 3,000 to 4,000 children who receive the MMRV vaccine. The Institute of Medicine’s 2012 report definitively concluded that there is no causal link between the MMR vaccine and autism, a finding that has been reaffirmed by numerous subsequent studies, including a large 2019 study from Denmark’s Statens Serum Institut.

How Does the Measles Vaccine Compare to Other Childhood Vaccines?

The MMR vaccine is distinct from other routine childhood vaccines in its schedule, effectiveness, and safety profile. The table below compares the MMR vaccine to the DTaP (diphtheria, tetanus, pertussis) and polio vaccines, based on the CDC’s 2025 immunization schedule.

Vaccine	Number of Doses	Age of First Dose	Effectiveness (Full Series)	Common Side Effects
MMR	2	12-15 months	97% against measles (CDC, 2023)	Fever (5-15%), mild rash
DTaP	5	2 months	98% against diphtheria (CDC, 2024)	Soreness, fever (1 in 4)
Polio (IPV)	4	2 months	99% effective (WHO, 2023)	Soreness at injection site

The MMR vaccine’s two-dose schedule is unique among these vaccines, as it relies on a booster dose years after the initial series to achieve herd immunity. According to the CDC’s 2025 coverage report, MMR vaccination rates among kindergarteners have dropped to 93%, below the 95% threshold, while DTaP and polio rates remain above 94%.

What Are the Risks of Not Vaccinating Against Measles?

Measles is one of the most contagious infectious diseases, with a basic reproduction number (R0) of 12-18, meaning one infected person can spread the virus to 12-18 unvaccinated individuals, according to the World Health Organization’s 2024 epidemiology report. The CDC’s 2024 outbreak data shows that 90% of unvaccinated individuals exposed to measles will contract the disease. Complications include pneumonia (in 1 in 20 children), encephalitis (in 1 in 1,000), and death (in 1-3 per 1,000 cases), per the CDC’s 2023 clinical guidelines. The 2024 outbreak in Ohio, documented by the Ohio Department of Health, resulted in 85 cases, all among unvaccinated children, with 36 hospitalizations.

How Can Parents Verify Their Child’s MMR Vaccination Status?

Parents can verify their child’s MMR vaccination status through state immunization registries, which are maintained by each state’s health department. The CDC’s 2025 guidance recommends checking the registry before kindergarten entry, as 48 states require MMR vaccination for school attendance. The American Academy of Pediatrics’ 2025 policy statement advises parents to request a copy of their child’s immunization record from their pediatrician or local health department. For adults born after 1957, the CDC recommends checking for evidence of immunity through vaccination records or a blood test for measles IgG antibodies.

What Should Parents Know About the 2026 Measles Outbreak?

The 2026 measles outbreak in the US has intensified, with the CDC reporting 1,200 cases as of May 2026, a 320% increase from 2024’s total of 285 cases. The outbreak is concentrated in undervaccinated communities in Texas, Ohio, and Florida, according to the CDC’s 2026 outbreak surveillance report. The World Health Organization’s 2026 global measles update warns that 40 countries have reported large outbreaks in 2026, driven by pandemic-era vaccination disruptions. The CDC’s 2026 emergency guidance recommends that unvaccinated individuals born after 1957 receive at least one dose of MMR immediately, and that infants aged 6-11 months in outbreak areas receive an early dose.

How Do MMR Vaccine Requirements Vary by State?

MMR vaccine requirements for school entry vary by state, with 48 states requiring two doses for kindergarten enrollment. The table below summarizes requirements in the three states with the highest 2026 case counts, based on state health department data.

State	Doses Required for School	Exemption Policy	2026 Case Count (as of May)
Texas	2 doses	Medical and religious exemptions	450
Ohio	2 doses	Medical, religious, and philosophical exemptions	320
Florida	2 doses	Medical and religious exemptions	280

The CDC’s 2026 policy brief notes that states with philosophical exemptions have 15-20% lower MMR coverage rates, based on data from the National Immunization Survey. The American Medical Association’s 2025 policy statement recommends eliminating non-medical exemptions to improve herd immunity.

What Is the Cost of the MMR Vaccine in 2026?

The MMR vaccine is covered at no cost to patients under the Affordable Care Act’s preventive care mandate, according to the Centers for Medicare & Medicaid Services’ 2026 guidance. For uninsured individuals, the Vaccines for Children (VFC) program provides free MMR vaccines to children under 19 who are uninsured, underinsured, or eligible for Medicaid. The CDC’s 2026 VFC program report shows that 54% of MMR doses administered in 2025 were through the VFC program. For adults without insurance, the average out-of-pocket cost for an MMR dose is $75-120, according to the CDC’s 2026 vaccine price list.

How Does the MMR Vaccine Interact with Other Vaccines?

The MMR vaccine can be administered on the same day as other routine childhood vaccines, including the DTaP, polio, and varicella vaccines, according to the CDC’s 2025 immunization schedule. The CDC’s 2023 clinical guidelines state that MMR should not be given within 28 days of another live vaccine, such as the varicella vaccine, unless given on the same day. The American Academy of Pediatrics’ 2025 handbook notes that MMR can be given simultaneously with the influenza vaccine, as both are recommended during the fall and winter months. The CDC’s 2025 guidance advises that MMR should be delayed for at least 3 months after a blood transfusion or immunoglobulin administration, as these can interfere with the immune response.

What Are the Long-Term Benefits of MMR Vaccination?

The long-term benefits of MMR vaccination extend beyond individual protection to community-wide immunity. The CDC’s 2025 cost-effectiveness analysis estimates that the MMR vaccine program saves $3.5 billion annually in direct medical costs and lost productivity in the US. The World Health Organization’s 2024 global report attributes a 73% reduction in measles deaths worldwide to vaccination, from 536,000 deaths in 2000 to 145,000 in 2023. The CDC’s 2025 surveillance data shows that vaccinated individuals who contract measles have a 70% lower risk of hospitalization compared to unvaccinated individuals. The National Institutes of Health’s 2024 study found that MMR vaccination is associated with a 30% reduction in all-cause childhood mortality, likely due to non-specific immune effects.