Massachusetts Measles Cases in 2026
Last updated:
Is there a measles outbreak in Massachusetts? This page tracks confirmed measles cases in Massachusetts for 2026, updated weekly with data from the Johns Hopkins Measles Tracking project. See how Massachusetts compares to other states and check local MMR vaccination rates.
confirmed in Massachusetts in 2026
As of 2026-04-03
⚠ 2 outbreaks reported
Key Takeaways
- 1 Massachusetts has reported 2 confirmed measles cases so far in 2026.
- 2 There are 2 active outbreaks in the state.
- 3 Greater Boston has the most cases with 1 confirmed.
- 4 Nearby states New York, Vermont have also reported cases.
CDC Recommendations at This Level
Active measles outbreak — vaccination is urgent
- • The CDC strongly recommends MMR vaccination for anyone who is not up to date
- • Measles is extremely contagious — it spreads through the air and can linger in a room for 2 hours after an infected person leaves
- • If you develop symptoms, call your doctor BEFORE going in — they need to prepare to avoid exposing others
- • Unvaccinated individuals should avoid public spaces where cases have been reported
- • Infants too young for MMR (under 12 months) should avoid known outbreak areas
This is general public health guidance based on CDC recommendations — not personal medical advice. Talk to your healthcare provider about what's right for you and your family.
County Breakdown — Massachusetts
| County | Cases | Last Report |
|---|---|---|
| Greater Boston | 1 | 2026-02-27 |
| Unknown County | 1 | 2026-02-27 |
County-level data from JHU Measles Tracking Team. Some counties may have additional unreported cases.
MMR Vaccination Coverage in Massachusetts
Kindergarten MMR coverage in Massachusetts is 96.6% , meeting the 95% herd immunity threshold.
View Massachusetts MMR coverage details →Nearby States
| State | Cases (2026) |
|---|---|
| 7 | |
| 0 | |
| 0 | |
| 0 | |
| 1 |
Sources & Methods
Measles case counts are compiled by the JHU Measles Tracking Team from state and local health department reports. County-level data may be incomplete. The CDC also publishes national measles case counts. Learn more about our methods .
More Health Data for Massachusetts
Cities in Massachusetts
Health data available for these Massachusetts cities:
Frequently Asked Questions
How many measles cases has Massachusetts had in 2026?
Massachusetts has reported 2 confirmed measles cases in 2026 as of the most recent data update. This count may change as new cases are confirmed or reclassified.
Is there a measles outbreak in Massachusetts?
Yes, Massachusetts has reported active measles outbreaks. An outbreak is defined as a chain of three or more linked cases. Check with your local health department for the most current information.
What is the MMR vaccine and why does coverage matter?
The MMR vaccine protects against measles, mumps, and rubella. Measles is highly contagious and requires approximately 95% community vaccination coverage to achieve "herd immunity" — the threshold at which enough people are immune to prevent sustained transmission. View Massachusetts MMR coverage data .
Local Health Signal is not affiliated with the CDC or any government agency. Data is provided for informational purposes only and is not intended for clinical decision making. See our methods page for details on data sources and limitations.