Delaware’s Confirmed Measles Cases: What Parents Need to Know
After Delaware recently confirmed five measles cases (as of July 27, 2026), many parents are wondering what this means for their children and families.
The Delaware Division of Public Health (DPH) confirmed the first case on July 20, followed by four additional linked cases over the next several days. The outbreak started with an unvaccinated male in Kent County, and public health officials are working on contact tracing to identify anyone who may have been exposed.
Delaware has now declared a measles outbreak, which the Centers for Disease Control and Prevention (CDC) defines as three or more cases connected by time and location.
While this news can feel alarming, parents can be reassured that the measles, mumps, and rubella (MMR) vaccine provides strong protection against the virus.
Beebe Healthcare and Beacon Pediatrics are sharing what families should know about measles, including symptoms, risks, and when to reach out to your child’s healthcare provider.
If my child is vaccinated, should I be concerned?
One of the big questions parents might have is: “My child received the MMR vaccine. Are they still at risk?”
Here’s the good news: children who are fully vaccinated have excellent protection against measles.
The MMR vaccine is one of the most effective vaccines available:
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One dose is about 93% effective at preventing measles.
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Two doses are about 97% effective.
This means children who have received both recommended doses are very unlikely to become infected.
It’s also important to understand that even though Delaware has declared a measles outbreak, there is currently no sign of widespread community transmission.
Who is most at risk?
Measles can impact anyone who is not protected against the virus. Individuals at the highest risk include:
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Children who have not been vaccinated
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Infants younger than 12 months who are too young for the MMR vaccine
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Pregnant people who don’t have immunity
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People with weakened immune systems
Since measles spreads very easily, those without protection against the virus are more likely to become infected or develop complications.
Symptoms to look out for
Measles symptoms typically appear 7 to 14 days after exposure but can also develop up to 21 days later.
Early symptoms include:
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High fever
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Cough
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Runny nose
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Red and watery eyes
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Koplik spots (small white spots inside the mouth)
A rash will usually develop a few days later, beginning on the face and spreading down to the rest of the body.
What should you do if your child may have been exposed?
If you think your child might have been exposed to measles, here are the next steps to take:
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Call your child’s health provider. They will confirm your child’s vaccination status and schedule a vaccine if needed. Receiving the vaccine within a few days of exposure can help prevent infection.
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Monitor for symptoms for up to 21 days.
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Call your doctor’s office before going in. This allows them to take precautions to prevent exposing patients and staff.
Your healthcare provider can help you figure out a plan of action based on your child’s vaccination status, age, and exposure details.
What to know about the MMR vaccine
If you have questions about your child’s MMR vaccine status, your pediatrician will review their records and let you know if any additional doses are recommended.
The CDC recommends:
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First MMR dose: 12-15 months of age
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Second MMR dose: At least 1 month after first dose; usually given between 4-6 years of age
Older children, teens, and adults who are unsure of their immunity or vaccination status should talk with their healthcare provider about whether they need an MMR vaccine.
My child is too young for the MMR vaccine. What should I do?
For children who are too young to receive an MMR dose, the best way to protect them is to avoid exposure to anyone who may have measles. Also, check in with family members and any caregivers to make sure they are up to date on their vaccinations.
In some cases during an outbreak, the MMR vaccine can be given as early as six months. Contact your pediatrician to learn more and discuss this option further.
Where can families get an MMR vaccine?
MMR vaccines may be available through your primary care office, child’s pediatrician, Cape Pharmacy, or other local pharmacies. Make sure to call ahead to confirm availability and eligibility requirements before you go.
If the vaccine is not available in your preferred location, you can contact a Delaware Public Health Clinic.
Questions or concerns? We’re here for you.
Delaware’s measles cases are an important reminder that measles can still occur in communities today. Fortunately, children who are fully vaccinated with the MMR vaccine have strong protection against becoming infected.
We encourage families to stay informed, check vaccination records, and reach out to their child’s healthcare provider with questions.
If you have any concerns about your child’s health, Beebe Healthcare and Beacon Pediatrics are here to support you, including the Nemours Children’s Health pediatric hospitalists who provide inpatient care at the Margaret H. Rollins Lewes Campus.
By Bill Chasanov, DO, Board-Certified Infectious Disease Physician and Erin Fletcher, DO, Board-Certified Pediatrician
