The Ennis Independent School District says a letter will be sent to a group of high school students and their parents to help identify potential contacts.
A district statement, released Monday night, says free screenings will be done Sept. 14 at Ennis High School, which is the only campus affected by the notice. Medical care will be provided to anyone who may have been exposed to the educator.
Further details on the teacher haven't been released. The district says the risk of exposure and infection to the general campus population is extremely low.
Classes began Aug. 22.
Experts say TB is spread through the air. The disease, if not properly treated, can be deadly.