Measles 2026

 Measles is back in news, sigh.

Once upon a time, a dad gave Nurse Judy a huge compliment. He told her that in the moment of dealing with pinworms, he wasn’t expecting to burst out laughing from the blog post. He appreciated the humor.

We do try to lighten the mood when dealing with a lot of childhood afflictions, but unfortunately Measles isn’t one of them. There is nothing much amusing about this post.

For those paying attention, there have been multiple measles outbreaks across the country over the last two years. But this week’s news is particularly troubling: the United States may officially lose its measles “elimination status,” a public health achievement we’ve held since 2000.

What does that mean, exactly?

In 2000, measles was declared eliminated in the United States. That didn’t mean there were zero cases. People could still bring measles into the country after traveling abroad, and occasionally those cases would spark small outbreaks. But there was no continuous community spread. Now, more than 25 years later, that achievement is in jeopardy.

This week, November 10-13, 2026, an international panel of experts convened by the Pan American Health Organization (PAHO) is reviewing whether we can still make that claim. If continuous transmission is confirmed and PAHO withdraws elimination status, measles will once again be considered endemic in America. That’s a pretty frustrating step backward for a disease we know how to prevent.

And the numbers aren’t encouraging. As of November 5, 2026, CDC reported 5,182 confirmed measles cases in the United States this year, more than twice the 2,289 reported in all of 2025.

Regardless of our status, we have seen cases spiking over the past two years. Because of this, unsurprisingly, we’ve received a steady stream of questions from parents of young children. Should my baby get vaccinated early? Is it safe to travel? How worried should I be if my child isn’t old enough for the MMR vaccine?

These are reasonable questions, It’s scary! Especially if you have a baby under 12 months old.

So, spurred by this week’s news, we thought it was time to update our measles post.

How worried do I need to be?

The good news is that if your child has received both doses of the MMR vaccine, they are extremely well protected against measles. Even children who have received just one dose after their first birthday have excellent protection.

The children we’re most concerned about are those who are too young to be vaccinated, those who haven’t received their vaccines, and children with certain immune system conditions that prevent them from being vaccinated.

It’s also important to remember that measles outbreaks are not occurring equally everywhere. The risk to a child living in an area with high vaccination rates is very different from the risk to a child living in a community with an active outbreak.

You can click here to check the vaccination rates in your county

So while the national news is concerning, if you are in a county with high vaccination rates it doesn’t necessarily mean your child’s immediate risk has dramatically increased.

How effective is the measles vaccine?

Very!

Measles protection is given as part of the MMR vaccine, which protects against measles, mumps, and rubella.

Here’s something that may surprise you:

One dose of MMR, given on or after a child’s first birthday, is approximately 93% effective at preventing measles.

A second dose increases that protection to approximately 97%.

These are remarkably good numbers. And for most people, protection against measles lasts a lifetime.

You might wonder why the second dose only improves protection by four percentage points. The answer is that the second dose isn’t really a traditional booster. Instead, it’s intended to protect the small percentage of children whose immune systems didn’t respond adequately to the first dose.

In other words, most children are already well protected after their first shot. The second shot helps catch the few who weren’t.

Why do we wait until age 4 for the second shot?

This is a question we’ve been hearing a lot lately.

Our routine vaccine schedule gives the first MMR dose at 12-15 months and the second at 4-6 years.

But here’s the interesting part: you don’t actually have to wait until age 4.

The second dose of the MMR vaccine can be given as early as 28 days after the first dose, provided the first dose was given on or after the child’s first birthday.

So why do we usually wait?

One dose already provides excellent protection, and when the schedule was established, the risk of measles was historically quite low in the United States. The second dose was scheduled at 4–6 years to ensure that children who didn’t respond to their first dose were protected before entering elementary school, when exposure opportunities increase.

There isn’t anything magical about a child’s fourth birthday that suddenly makes the vaccine work better.

If a child is traveling internationally, lives in an area experiencing an outbreak, or has another reason to need earlier protection, we can absolutely give that second dose earlier.

For most children in our community, however, the routine schedule remains appropriate unless public health recommendations or individual circumstances suggest otherwise.

One important technical detail: the 28-day minimum interval applies to the MMR vaccine. If we’re using the combined MMRV vaccine (which also includes chickenpox), the minimum interval between doses is generally three months for children under 13.

What about babies under 12 months?

This is probably the question that causes the most anxiety among parents.

We routinely give the first MMR vaccine at 12 months because the immune response is more reliable at that age. Younger infants may still have maternal antibodies that interfere with the vaccine’s effectiveness, and their immune systems respond differently. Yes, most of those antibodies have decayed in the first 6 months of life, but the ones that linger are still able to neutralize the vaccine before it can do the best job.

But that doesn’t mean we can’t vaccinate earlier.

For babies between 6 and 12 months, we recommend an early MMR dose before international travel. We may also recommend it during a local outbreak if public health authorities advise vaccinating infants in this age group.

But what about me, and my holiday travel to the east coast? Unfortunately, with the current rates of transmission, we think it’s probably worth the early shot. Dr. Ted will be vaccinating his now 8-month-old before his New Year’s trip to NY.

There’s one catch: a dose given before the first birthday doesn’t count toward the routine two-dose series and may or may not be covered by insurance.

So a baby who gets MMR at 8 months will still need another dose at 12–15 months and a final dose later in childhood (or earlier if indicated).

For babies younger than 6 months, the MMR vaccine isn’t recommended. It’s not that it’s dangerous, it’s just been shown that it isn’t effective. I wish we had a better answer for you, but protecting your infant usually depends largely on avoiding exposures to crowds, and making sure that the people who spend time with them are fully vaccinated.

Should every 6-month-old get an early MMR vaccine just because measles is in the news?

Not necessarily. We need to consider whether there’s an active local outbreak, where you might be traveling, as well as your child’s individual circumstances. Dr. Ted is happy to discuss this with his families.

Measles is one of the most contagious viruses known to humans.

And that is what makes all of this so tricky!

Approximately 90% of susceptible people who are exposed to measles will become infected.

Think about that for a moment. Nine out of ten!

And unlike many respiratory viruses, measles spreads through tiny airborne particles that can remain suspended in the air for up to two hours after an infected person has left the room.

Someone with measles can also spread the virus for four days before the characteristic rash appears, and for four days afterward. So people may be contagious before anyone realizes they have measles.

This combination makes measles extraordinarily good at spreading through communities.

Let’s talk about herd immunity.

Imagine a forest.

After a rainstorm, the trees are moist. A spark is unlikely to cause much damage. But if the trees are dry and brittle, that same spark can cause a raging inferno.

Vaccination is a little like keeping those trees wet.

When nearly everyone in a community is vaccinated, an imported measles case has a difficult time spreading. The virus encounters protected people and transmission chains tend to stop.

But when vaccination rates fall, there are more and more dry trees. Suddenly, a single spark can start a much larger fire.

And some people can’t help being dry trees. Babies who are too young for vaccination and children with certain immune system conditions depend on the rest of us to help protect them.

Because measles is so contagious, communities generally need approximately 95% immunity to prevent sustained transmission.

Unfortunately, vaccination rates have fallen in parts of the United States, leaving more communities vulnerable to outbreaks.

That’s why vaccination isn’t just about protecting your own child. It’s also about protecting the people around them.

What does measles actually look like?

Measles doesn’t usually begin with a rash. In fact, it often starts looking like a particularly miserable respiratory virus.

After an incubation period of approximately 7-14 days, children typically develop a high fever, cough, runny nose, and red, watery eyes.

Some children develop tiny white spots inside their mouths, called Koplik spots, which can be an early clue.

A few days later, the characteristic rash appears.

The rash usually begins around the face and hairline, then spreads downward to the neck, trunk, arms, and legs over the next several days.

The spots are generally red and flat or slightly raised, and they can merge together as the rash progresses. On darker skin, the rash may appear brownish or purplish rather than bright red.

The fever often peaks around the time the rash appears and can be quite high, sometimes exceeding 104°F.

Most children recover, but measles can cause serious complications.

The dangers of measles

Measles is much more than an uncomfortable rash.

About 1 in 5 unvaccinated people in the United States who get measles are hospitalized.

Pneumonia is one of the most common serious complications and is a major cause of measles-related deaths.

Approximately 1 in 1,000 children with measles develops encephalitis, an inflammation of the brain that can cause permanent neurologic injury.

And approximately 1-3 out of every 1,000 children infected with measles die from respiratory or neurologic complications.

Measles can also cause something called immune amnesia. The virus damages immune memory cells, leaving children more vulnerable to other infections for months or even years afterward.

There is also a very rare but devastating delayed complication called subacute sclerosing panencephalitis (SSPE), a progressive neurologic disease that can appear years after the original infection.

None of this means that every child who catches measles will become seriously ill. Most recover. But the complications are significant enough that preventing the disease is enormously preferable to treating it.

What should I do if I think my child has measles?

First, please call before going into any health care facility office.

Because measles spreads through the air so easily, doctors offices need to make special arrangements to evaluate a child who might be infected without exposing other patients in the waiting room.

If your child has had a known measles exposure, let your doctor know immediately.

Depending on your child’s age and vaccination history, there may be an opportunity to prevent or reduce the severity of infection after exposure.

For children over 6 months, the MMR vaccine can provide protection when given within 72 hours of exposure.

For certain high-risk individuals, including infants too young for MMR, immune globulin may be recommended within six days of exposure.

These interventions are time-sensitive, so please don’t wait for symptoms to develop before reaching out to your doctor.

If your child has suspected measles, your doctor will also need to work with public health authorities to arrange appropriate testing and isolation guidance.

Extra note for adults -

Depending on when you were born, your original vaccination may or may not be still providing protection. You may have been given only 1 shot, a one time common practice; you may have been given an inactivated virus shot, which was also a long ago common practice; or if you were inoculated in the 1960s, you may have been given a relatively ineffective vaccine because of now-known manufacturing problems. The best way to make sure is to have your titers measured, or you can do what Nurse Judy did last year and simply get a booster. Talk to your doctor about the best option for you.

The bottom line

It’s frustrating to be writing about measles outbreaks in 2026.

We have a vaccine that is extraordinarily effective, has been used for decades, and helped eliminate continuous measles transmission in the United States for more than 25 years.

And yet, here we are.

The good news is that the vast majority of appropriately vaccinated children are very well protected. If your child is up to date on their MMR vaccines, there’s generally no reason to panic or change your everyday activities.

If your child is too young for vaccination, is traveling internationally, or has missed a scheduled dose, it’s worth having a conversation with your doctor about the best way to keep them protected.

We can’t control every measles outbreak happening around the country. But we can make sure our children and our community are as well protected as possible.

And hopefully, someday soon, measles will go back to being something we rarely need to write about.