Health officials said an unvaccinated child with measles is a known contact of a recent measles case tied to Broomfield High School.

ADAMS COUNTY, Colo. — Health officials have confirmed another case of measles tied to a school in Broomfield.

The Colorado Department of Public Health and Environment said a Broomfield Heights Middle School student from Adams County is a known contact of a recent measles case tied to Broomfield High School. 

Because this is the third connected case, public health officials have officially classified the situation as a measles outbreak, according to CDPHE.

CDPHE said students and staff who may need to take additional health precautions will be contacted directly by local public health officials and school administrators. Other exposures for the infected person are under investigation. 

The first case tied to Broomfield High School, a Broomfield resident who attended the school, was announced on Friday. Boulder Valley School District sent a letter to families informing them of a possible measles exposure and said students and staff who were at the school on Feb. 20 and Feb. 23 may have been exposed.

The second case, an Adams County resident and fellow student, was announced on Monday. Health officials said there were possible exposures at the school on Feb. 24, Feb. 25, Feb. 26 and Feb. 27.

All three patients were unvaccinated.

After the first two cases were identified, Boulder Valley School District said staff were wiping down and disinfecting high-touch areas and increasing airflow at the high school to prevent the disease from spreading further.

People who were at the following locations at the dates and times listed may have been exposed to measles from the third patient and should watch for symptoms for 21 days, according to CDPHE.

Broomfield Heights Middle School, 1555 Daphne St., Broomfield

Tuesday, Feb. 17, 8:30 a.m. to 6 p.m.

Wednesday, Feb. 18, 8:30 a.m. to 6 p.m.

Thursday, Feb. 19, 8:30 a.m. to 6 p.m.

Broomfield Community Center, 280 Spader Way, Broomfield

Thursday, Feb. 19, 7:35 p.m. to 10 p.m.

Any new exposure locations will be added to the CDPHE exposures webpage as they are identified.

If symptoms develop, call CDPHE at 720-653-3369 or your local public health agency right away. Those who need medical care should call their health care provider, urgent care, or emergency department before going in and tell them they have been exposed to measles. Monitoring for symptoms is especially critical for people who are not vaccinated, according to CDPHE, particularly infants under 1 year old who are not routinely recommended for the vaccine.

Measles is a highly contagious but preventable disease. CDPHE said getting vaccinated is the best way to protect yourself, your family and the people around you.