The Connecticut Department of Public Health (DPH) confirmed the state's second measles case of 2026 on Monday, June 29.
The patient is a vaccinated adult living in Hartford County.
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State health officials said the infection produced a weak positive result during testing at the State Public Health Laboratory over the weekend.
The individual had received two doses of the MMR vaccine and is now recovering at home with symptoms including fever, cough, and a rash.
According to DPH, the person was exposed two weeks ago to Connecticut's first measles case of the year—an unvaccinated adult who had recently traveled internationally.
Officials noted that infections in vaccinated individuals tend to be milder and pose a lower transmission risk.
Vaccination Remains Key Protection
DPH Commissioner Manisha Juthani, MD, explained the significance of the patient's vaccination status.
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“Because this individual was vaccinated, their symptoms are milder and their test result is a low-level positive, meaning that they are shedding a small amount of virus,” she said.
Juthani emphasized the effectiveness of immunization despite this breakthrough case.
“Two doses of the MMR vaccine are about 97 percent effective at preventing illness, but if you have been in close contact with someone with measles, you could increase your chance of becoming infected.
That is why vaccination is still our best protection tool,” she added.
Before these two cases, Connecticut had recorded only two positive measles infections over the past five years, both in unvaccinated individuals who had traveled abroad.
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Nationwide, health officials report 2,134 measles cases so far in 2026, which is 150 fewer than the total for all of 2025.
