The Vermont Department of Health says three more students at Charlotte Central School have tested positive for tuberculosis.
The cases were discovered after a round of screening clinics held March 30 through April 3.
A total of 19 children and two adults have tested positive since the health department first confirmed a case of TB at the school in January.
Vermont State Epidemiologist Patsy Kelso says a positive test result does not mean the person is sick with TB.
"They have what we call latent TB infection. So they're infected with TB but that does not mean that they're sick with TB and they cannot pass TB on to anyone else because they're not sick with it," she says.
Kelso says there are no active cases of TB at the school and the health department says there is no ongoing risk.
Kelso says that without treatment, the children who have tested positive have a slight chance of developing full tuberculosis. She says they will be offered a nine-month course of an antibiotic that will prevent them from getting sick.