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Measles has been making headlines again in 2026. Case counts have been rising in the US compared to recent years, and this year has included measles deaths — a stark reminder that a disease many parents think of as a thing of the past is still very much circulating, and still capable of seriously harming a child. Most of the cases and severe outcomes are occurring in unvaccinated people.
Why measles is spreading again
Measles was declared eliminated in the US in 2000, meaning it was no longer continuously spreading here. That status depends on keeping vaccination rates high enough (around 95%) for community, or "herd," immunity. In communities where vaccination rates have dropped below that threshold, the virus has been able to take hold again once introduced, spreading fastest among people who aren't vaccinated.
Why measles is genuinely dangerous
Measles isn't just a rash — it's one of the most contagious diseases known. If one person has it, up to 9 out of 10 unprotected people who come into close contact with them will become infected. It spreads through the air, including by lingering in a room after an infected person has left.
For most people it's a miserable illness. For infants and children under 5, it's more than that: measles can lead to ear infections, diarrhea, pneumonia, and — less commonly but seriously — encephalitis (brain swelling), permanent hearing loss, or death. Babies too young for the vaccine are among the most vulnerable.
Symptoms and timeline
- Days 0-14 (incubation): no symptoms yet — measles typically takes 7 to 14 days to show up after exposure.
- First symptoms: high fever, cough, runny nose, and red, watery eyes — easy to mistake for a common cold at first.
- 2-3 days in: tiny white spots (Koplik spots) may appear inside the mouth.
- 3-5 days after symptoms start: the telltale rash appears — flat red spots starting at the hairline, spreading down the face, neck, trunk, and out to the arms and legs.
A person is contagious starting about 4 days before the rash appears and remains contagious for about 4 days after — meaning someone can spread measles before they, or anyone around them, even knows they're sick.
Why vaccination is the main defense
The MMR (measles, mumps, rubella) vaccine is highly effective — two doses provide strong, long-lasting protection for most people. The standard US schedule calls for the first dose at 12-15 months and a second at 4-6 years, though your pediatrician may recommend an earlier first dose if there's active measles activity in your area or you're traveling internationally with an infant.
If your baby is too young to be vaccinated
- Infants under 12 months typically haven't had their first MMR dose yet, so they rely on the vaccinated people around them for protection.
- Ask your pediatrician about local measles activity before travel, especially internationally or to an area with an active outbreak.
- Keep other vaccinations and general health checkups on schedule — a strong overall health baseline helps with any illness.
- If you know of a specific measles exposure, call your pediatrician promptly — they may have guidance specific to your baby's situation.
What to do if you suspect measles
Call your pediatrician or doctor before going in — describe the symptoms over the phone so the office can arrange to see your child without exposing others in the waiting room. Seek emergency care for difficulty breathing, a stiff neck, extreme drowsiness, or a seizure, which can signal a serious complication.
