Eastern Health says it is nearly finished its investigation after a student at Holy Heart of Mary High School was confirmed to have the infection in May.
Public health officials have since tested 49 people considered to be close contacts to the student and say six of them have been exposed to tuberculosis at some point in their lives.
But Dr. David Allison, Eastern Health's medical officer of health, says their exposure may not be related to the case at the school and often people who test positive for tuberculosis have a dormant or latent type of the disease, which is not infectious.
Still, Allison says information about those six people has been forwarded to their doctors who will make decisions about preventive treatment, as there is a small chance of dormant tuberculosis becoming active over time.
He says there is no cause for concern for the students and teachers who attend the school.