Another 27 students and two teachers at Hillside Intermediate School have tested positive for exposure to tuberculosis.

Skin tests were conducted last week at the school, 2375 E. Garfield Ave., for a second time, revealing those exposures, said Jana Carlson-Kettering, public information officer for Salt Lake City-County Health Department. Initial skin tests conducted in March revealed 75 in the school had been exposed to TB.But testing positive for TB exposure does not mean the person is or will become ill, Carlson-Kettering said. Rather, those testing positive underwent chest X-rays, were prescribed medication and will be monitored over a six-month period.

"We have not found another active case," Carlson-Kettering said. "Our judgment is that we're done at the school."

The school's some 800 students and staff were urged to receive free skin tests at the school after a classmate was diagnosed with active tuberculosis last March.

For the tests, nurses inject a solution under the skin. If a bump develops over the following few days, the test is positive. Infection can lie dormant for 10 to 12 weeks.

Initial tests were conducted en masse; last week's tests were conducted by appointment at the school. In all, about 600 were tested.

"We haven't really had a testing of this magnitude. We're pleased with all the collaboration" with health departments, school officials and families, Carlson-Kettering said.

Tuberculosis is an infection of the lungs that spreads through coughing. Fever and weight loss are classic symptoms. The disease, a major killer in some parts of the world, is treatable with oral medication taken over several months.

Last year in Utah, there were 36 reported cases of TB.