Students, faculty, and staff at Lowell High School will undergo skin tests this week and next after a student was diagnosed with tuberculosis.

WCVB reported that the freshman showed signs of the disease for months but was only officially diagnosed last week when her symptoms worsened. While her diagnosis was recent, the report added that Lowell Health Department Director Frank Singleton said the student hasn’t been in school for weeks.

A report from WHDH said the school’s testing would start with a dozen or so teachers this week before moving to over 100 students next week. A second round of testing is expected to be completed in August to confirm no positive cases before the start of the new school year.

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The Associated Press reported that even positive tests are not an indication that a person has the disease. Anyone from the school who tests positive will be referred to Lowell General Hospital for treatment. The report added that Massachusetts sees between 200 and 250 cases of tuberculosis each year.