Measles is back in the spotlight—it’s alarming how this highly contagious virus seems to be spreading rapidly. In South Carolina, the number of cases is approaching 1,000, surpassing last year’s major outbreak in Texas, which concluded with 762 cases. In fact, infections are being reported across twenty states. Canada has also reclaimed its measles elimination status, and concerningly, the current administration is proposing to alter the MMR vaccine into separate shots, despite no clear health advantages, which could, unfortunately, decrease vaccination rates.
For a long time now, Americans have enjoyed a relatively measles-free existence, so it’s understandable if you need a bit of a refresher on what this disease entails. Here’s a quick overview.
Is measles really a big deal?
Historically, before the vaccine was introduced, measles was a serious public health concern. Almost every child would contract it, leading to nearly 50,000 hospitalizations annually and numerous fatalities. It wasn’t until coordinated public health efforts eliminated the continuous spread in the U.S. around the year 2000 that we felt somewhat secure. Of course, measles never quite disappeared; cases have occurred every year, and while we halted the ongoing circulation, many people remain unexposed to this aggressive virus. And unfortunately, it’s a serious illness: 20% of unvaccinated individuals who contract it end up in the hospital, with some facing lifelong complications.
Recently, public health experts are raising alarms about the current outbreaks, noting their size and speed. Last year saw the highest number of measles cases in the U.S. since 1991, and this year might actually surpass those figures. Plus, three fatalities occurred last year, which is quite alarming, especially considering only three deaths had been recorded since 2000.
I’m worried. What should I do?
Despite the high hospitalization rates and contagiousness of measles, we have a highly effective weapon against it: the vaccine. To keep yourself safe from measles, just make sure you’ve received both doses of the MMR vaccine—it really is that straightforward.
How do I verify my vaccination status? Should I consider a booster?
Well, figuring that out can be a bit tricky. However, the recommendations are clear: the current MMR vaccine offers lifelong immunity. So, if you were born after 1989, no booster is necessary.
Individuals born between 1957 and 1989 might want to consider a booster due to earlier, less effective vaccinations. Those born before 1957 typically gained immunity naturally by having survived the illness and don’t require a booster.
If you’re unsure about your vaccination status—maybe you can’t find your records or were born during a transition period—getting an additional dose generally won’t hurt. But if you know you’re fully vaccinated, you definitely don’t need to get another shot.
Am I fully protected if I’ve been vaccinated?
The MMR vaccine is remarkably effective, providing complete protection for about 97% of those who receive the two doses. This sets it apart from vaccines for illnesses like the flu and COVID, which primarily alleviate symptoms rather than prevent infection entirely. With measles, just 3% of vaccinated individuals will experience breakthrough infections, and if they do, their symptoms are usually much milder.
Is it safe to gather in large crowds if I’m vaccinated? What about traveling?
Generally, yes. If you’re vaccinated with the MMR, it’s considered safe to participate in those activities. The high efficacy of the vaccine significantly lowers your risk of contracting the virus. And should you somehow get infected, your symptoms are likely to be mild.
When it comes to travel, it’s crucial to keep in mind the vaccination status of those you’re traveling with, particularly if you’re going to areas with noted outbreaks. For instance, a 3-month-old baby who hasn’t been vaccinated yet is at much greater risk.
What about those unvaccinated individuals in my life?
It’s important to remember that some folks, including infants and people with compromised immune systems, can’t get vaccinated. Vaccinated individuals who later become immunocompromised may also have diminished immunity. These groups are particularly vulnerable, emphasizing the need for widespread vaccination. Still, it’s quite uncommon for vaccinated people to transmit measles, even if they contract it. This is a stark contrast to the COVID era when asymptomatic individuals could still infect others. Measles doesn’t work that way.
If you’re close to someone who is unvaccinated by choice, it’s very unlikely you would pass the virus to each other, but it could be worth discussing their decision and sharing your reasons for getting vaccinated.
I’m immunocompromised and unvaccinated. What should I do?
Individuals in your situation should implement protective measures similar to those for flu and COVID, like wearing well-fitted N95 masks. It’s crucial to ensure that your close contacts are fully vaccinated and try to avoid traveling to outbreak areas.
What should parents of unvaccinated infants do?
Typically, health authorities recommend that children receive their first MMR dose between 12 and 15 months and the second dose at 4 to 6 years. This means they are vulnerable during their first year. However, some parents choose to give an early vaccine dose at 6 months. While this dose isn’t among the required two, it can still provide crucial protection during a vital time. Additionally, children older than one can receive their second dose earlier than the usual schedule if necessary to ensure they have the best protection sooner.
Traveling or living in areas with outbreaks can increase the urgency for early vaccinations. It’s wise to consult with pediatricians about vaccination timelines to make sure children are protected. Some pediatricians suggest administering an early dose, especially before going to busy places like Disney World.
And for those thinking about having children, it’s a good idea to check with your doctor regarding your MMR immunity levels. Mothers can pass on measles antibodies to their babies, which may linger for several months after birth.
Why are outbreaks occurring in other countries right now?
Interestingly, the U.S. isn’t the only country facing measles outbreaks. Canada reported over 5,000 cases last year, but that’s minor compared to Europe, which had over 127,000 cases in 2024. Low vaccination rates are a significant factor, but surprisingly, anti-vaccine sentiment isn’t the sole villain, even in the U.S. In Canada, issues such as vaccine accessibility, particularly in rural areas, have been pointed out. And in Europe, measles continues to circulate in some countries, which raises the risk of larger outbreaks.
Achieving herd immunity against measles is challenging—about 95% of the population needs to be vaccinated. If this threshold isn’t met, measles outbreaks can arise unexpectedly. Measles, due to its highly contagious nature, tends to emerge quickly with any dip in vaccination levels.
What else should I be aware of?
It’s still uncertain if we’ll see a major measles epidemic in the coming years. Experts note that we’re currently teetering on the edge, so to speak. Public health officials are monitoring the situation closely. Meanwhile, the best way you can contribute is to ensure you’re vaccinated and encourage those around you to do the same.
