The Quiet Return of Mumps: What You Need to Know

While recent headlines have been dominated by the significant surge in measles cases across the country, another "old foe" is making a quiet comeback. Recent data from the CDC and the Indiana Department of Health indicates a localized rise in mumps cases as we head into the spring of 2026.

With travel increasing and "Spring Break" around the corner, here is a breakdown of what is happening and how you can protect yourself and your family.

The Current Landscape

So far in 2026, the CDC has reported dozens of cases across 11 jurisdictions. While the numbers are lower than the 2019 peaks, the trend is upward.

• In Indiana: Our state has already recorded several confirmed cases this year.

• A Shift in Demographics: Interestingly, many of the current cases (including a notable cluster in Maryland) are appearing in adults rather than just children.

• The MMR "Gap": While the MMR vaccine is incredibly effective, it is approximately 86% effective against mumps (compared to 97% for measles). Over several decades, that small gap—combined with waning immunity—can lead to localized outbreaks.
  

Recognizing the "Chipmunk" Look

Mumps is most famous for parotitis—the painful swelling of the salivary glands that gives the face a puffy, "chipmunk-cheek" appearance. However, the virus often starts with more "stealthy" symptoms:

• Low-grade fever and headache

• Muscle aches and profound fatigue

• Loss of appetite

• Crucial Note: You are most contagious 2 days before the swelling starts and up to 5 days after.
  

Why It Matters for Adults

While mumps is often a mild illness, it can carry more significant risks for adults than for young children. Potential complications include:

1. Orchitis: Painful swelling of the testicles, which occurs in about 20% of infected young adult males.

2. Meningitis: Inflammation of the brain and spinal cord lining.

3. Hearing Loss: Though rare, mumps can lead to permanent sensorineural deafness.
   

Action Steps for You

1. Verify Your Records: Check the MyVaxIndiana portal or your personal records to ensure you’ve had both doses of the MMR vaccine. Adults born before 1957 are generally considered naturally immune.
   

2. Consider a Booster: If you are traveling to an area with an active outbreak or work in a high-density environment (like a school or hospital), talk to your physician about whether a third MMR dose is appropriate for you.
   

3. The 5-Day Rule: If you or a family member develops jaw swelling, isolate immediately. A strict five-day stay-at-home period is the standard for preventing a community-wide outbreak.
   

Stay informed and stay healthy. If you have questions about your immunity status or are experiencing symptoms, reach out to your primary care provider for a clinical evaluation. About Woodside Internal Medicine

At Woodside Internal Medicine, we provide personalized, concierge primary care to the Indianapolis community. Located at the intersection of N. Meridian St and 96th St, our practice serves patients in Carmel, Fishers, Zionsville, Westfield and North Indianapolis who value direct access to their physician and a proactive approach to wellness. Whether you need to verify your MMR immunity, discuss a booster, or manage your long-term health, we are here to offer expert internal medicine guidance in a comfortable, patient-centered environment. Disclaimer: The information provided on this blog is for educational and informational purposes only and is not intended as medical advice. While we strive to provide accurate and up-to-date health information, the landscape of infectious disease changes rapidly. Always seek the advice of your physician or another qualified health provider with any questions you may have regarding a medical condition or immunity status.