Two cancer research buildings at Baltimore-based Johns Hopkins Hospital were evacuated July 5 because of possible tuberculosis exposure, according to Reuters.
Here are four things to know:
1. A small amount of TB bacteria may have been released as a vial was being transported between the two cancer research buildings.
2. Employees were in the area when the exposure occurred. The affected staff have been isolated. They will be evaluated by the Baltimore Fire Department.
3. Beyond the employees that were present during the incident, "all indications are that no other individuals have been exposed," hospital spokesperson Kim Hoppe told Reuters.
4. Out of an abundance of caution, the two buildings will remain evacuated until cleared by public safety officials.