67 Jefferson City High School students and staff have tested positive for exposure to tuberculosis. The county tested 2,400 people this month, after a single student developed an active case of the disease. Those who tested positive are being referred to family doctors. Those who tested negative will be tested again in three months. Cole County health department Director Ivah Braun says exposure to T-B doesn’t necessarily mean it will develop into an active case, only that someone has been exposed.