More than a hundred students at Galena Park had to undergo tests for tuberculosis on Friday, after teen had became ill.

Health officials with the Harris County Public Health and Environmental Services announced the testing after a student at North Shore School was diagnosed with tuberculosis just days before the Christmas break. The sick student was treated now being able to return to school.

No other student has presented symptoms of tuberculosis, according to Craig Eichhorn, Galena Park ISD’s communications director. Galena Park has 1,957 students registered in grades 11-12.

Health officials have tracked 175 students who were close to the student including classmates, friends, and participants in extracurricular activities. They all were given a skin test on Friday. The county officials will read the results of the tests on Wednesday.

Tuberculosis is caused by a bacterium called Mycobacterium tuberculosis that is spread in the air. Considered a deadly disease, tuberculosis usually affects the lungs, but can also affect the spine, kidneys and brain two to eight weeks after an infection. The disease spread when an infected person coughs or sneezes. Tuberculosis can be prevented and treated with adequate medications, a statement released by the school said. Symptoms of tuberculosis include unintended weight loss, fatigue, a slight fever, night sweats, chills and a loss of appetite.