"The health department is on top of it. They're following all the proper procedures," Hammann said.
School officials say they do not believe any students at the school were affected, in part because some preliminary tests on the person were negative for TB, said Robert Parker, health officer for Washington County.
Symptoms of the disease include coughing, chest pain or coughing up blood. Officials tested phlegm from the individual, which turned up negative for TB, Parker said.
There are different forms of the disease in humans, but the most common develops in the lungs and that is what health officials are most concerned about, said Parker.
Parker said there was only a "very, very slim chance" that students or teachers who were not in the classroom with the person were exposed to any danger.
As a precaution, the Washington County Health Department has identified students and faculty members who were in closest contact with the person, and free TB tests will be offered to those people, school officials said.
People stricken with TB may complain of feeling weak or sick, or of having a fever and night sweats. The disease can cause permanent damage to the body and death if left untreated, Parker said.
Antibiotics fight the disease, and the cure rate is extremely high with the proper treatment, Parker said.
There is a difference between people who have a TB infection and TB disease. People with TB infection are not sick because the germ is inactive in the body, and it cannot be spread to others, officials said.
Parker said he believes the person at the Career Studies Center may have the disease.
Parker said incidences of the disease had been decreasing rapidly until the mid-1980s, but "we got complacent about it" and it started rebounding.
Last year, 21,337 cases of TB were reported across the U.S. That's a rate of eight per 100,000 people, according to the Centers for Disease Control in Atlanta.
-- Maryland, with 319 cases, or 6.3 per 100,000, was ranked 20th among the states in the U.S., the CDC said.
-- Pennsylvania had 583 cases in 1996, or 4.8 cases per 100,000. The state was ranked 27th.
-- West Virginia reported 57 cases, or 3.1 per 100,000, ranking it 34th in the country, the CDC said.
Staff writer Laura Ernde contributed to this story.