Four students at Oregon high school test positive for TB

Four students at Central Catholic High School in Portland, Oregon, recently tested positive for tuberculosis.

School principal John Garrow said that the students were not considered contagious and were not asked to leave the school, according to

"They don't have any symptoms," Garrow said, reports. "They don't have to do anything different."

The positive test results came only weeks after another person from the school, whom Garrow would not identify, tested positive for the infection. That person has not been allowed to return. After learning of the test results, the principal said it remains unclear where the infected persons contracted the illness.

"What they don't know is, were they infected anyway (before) or were they infected here," Garrow said, according to "It could have been a previous TB exposure."

Garrow said the four positive results were unsurprising.

"We tested 200, so we were convinced we were going to get some positive results," Garrow said, reports.

An area physician, Dr. Jennifer Vines, said that one to five percent of the general population would test positive for TB. The TB rate at Central Catholic is approximately two percent. A more accurate picture of the rate of infection is expected in January when another round of tests is conducted.