County identifies active case of tuberculosis at Renton High School

115 students were notified of possible contact with disease

A person at Renton High School was recently diagnosed with active tuberculosis, prompting King County health officials to host a free screening this week at the high school.

According to district Spokesman Randy Matheson, Public Health – Seattle &King County officials contacted the district late on Oct. 28 to notify them of the case. Matheson said the individual, whose name is not being released due to state law, was diagnosed after visiting their personal doctor, who passed the information on to county officials. It is unknown if the person is a student or staff member.

TB is an infectious disease caused by bacteria that are passed from person to person through the air, but it’s much harder to spread TB than the cold or flu.

TB usually affects the lungs, but can affect lymph nodes, bones, joints, and other parts of the body. A person with active TB in the lungs can spread the disease by coughing or sneezing. In King County, 98 new cases of TB disease were reported in 2015. On average, two cases of TB disease are diagnosed in King County each week.

The person with active TB disease is currently receiving treatment, and is not currently a risk for infecting others, according to the county. Most cases of TB are readily treatable with antibiotics that are commonly available. To become cured, a patient must complete the entire treatment, even after the patient is no longer infectious. If the treatment is interrupted before the bacteria are completely eliminated, TB can develop drug resistance and become much harder to treat.

School and health department officials have met several times and out of what Matheson called an “abundance of caution” have notified 115 students that they may have come in contact with the disease in a classroom and the school and that they are available to take the free screening Thursday at the school. Matheson said about half of those contacted have returned forms indicating they will be screened.

“The likelihood that anyone is infected by this person is extremely low,” Matheson said.

People at Renton High School who are identified through the blood test to be infected with latent TB may be recommended for treatment, so that they do not develop the disease in the future.

Unlike active TB disease, people with latent (or dormant) TB infection can’t spread it to others and are not ill with the disease. Approximately 100,000 people in King County have latent TB infection. While they aren’t contagious now, they could potentially have active TB in the future and also infect others.

Approximately 5 percent of newly infected contacts of a person with active TB develop active TB disease themselves within two years. An additional 5 percent become ill at some point over the remainder of their lives. Ninety percent of people with latent TB infection never develop active TB disease.

Matheson said the district would continue to work with the county to monitor the results of this week’s tests and would follow up with any students or staff who test positive for the disease.

Reach Editor Brian Beckley at 425-336-4959.

Talk to us

Please share your story tips by emailing

To share your opinion for publication, submit a letter through our website Include your name, address and daytime phone number. (We’ll only publish your name and hometown.) Please keep letters to 300 words or less.

More in News

A client searches for clothing at the Kiwanis Clothing Bank location in 2016. Leah Abraham/File photo
Kiwanis Clothing Bank will shutter unless it can find a new home

The clothing bank has been supporting Renton for over 50 years, but has had trouble finding a new home during the COVID-19 pandemic.

Charges filed in Seattle shooting death

Detectives believe the person who shot a 19-year-old in an occupied protest zone in June immediately fled the state

I-5 to close overnight in Federal Way Aug. 28-30

5-mile shutdown for new bridge construction at 70th Avenue East in Fife

Screenshot from Gov. Jay Inslee’s press conference on Aug. 5, 2020.
Inslee says schools in virus hot spots should stay closed

King County among high-risk counties; several school districts will have remote learning in the fall.

King County Election headquarters in Renton on Aug. 4 for the primary election. Haley Ausbun/staff photo
Inslee and Culp lead governor race; incumbent Dems ahead for Congress | Statewide results

Early results for governor, state schools chief, attorney general and more.

Democrats dominate King County legislative races | Election results

Here are the latest results for King County legislative candidates in the… Continue reading

Vote election badge. File photo
5th District results: Ramos leads House race; Anderson edging Mullett for state Senate

Early results have been reported in the 5th Legislative District races from… Continue reading

In the LaCrosse neighborhood in upper Kennydale, the process to get a 20 mph speed limit is almost complete. Haley Ausbun/Staff photo.
Renton neighborhood closing in on long-awaited 20 mph speed limit

The LaCrosse neighborhood’s request for a lower speed limit has faced delays due to COVID-19

King County Election headquarters in Renton, on primary Election Day, Aug. 4. Voters can return their ballot and register in-person at the election headquarters and other voting centers by 8 p.m. Haley Ausbun/Staff photo.
There’s still time to vote in the August primary

Turn in your ballot at any voting center by 8 p.m.

Most Read