ENNIS (CBSDFW.COM) – Parents in Ennis received a crash course in tuberculosis as state health officials tried to ease concerns about the spread of the disease Wednesday.

The Texas Department of State Health Services says 128 people have tested positive for the latent or non-active form of TB. And up to 10 people are now suspected of having active TB.

The jump in numbers is why hundreds of parents, many of them angry, packed the auditorium at Ennis High School Wednesday evening.

Parents wanted to know why hasn’t every student been tested and what’s being done to protect those who don’t have the disease. It’s proof that frustration is growing, and so are the number of TB cases.

So far 836 people in Ennis have been tested, with 481 tests already read.  The spread of TB has been traced to a former teacher at Ennis High School who had an active case of tuberculosis.