Three individuals have been diagnosed with tuberculosis at Robert E. Lee High School in Springfield and health officials are conducting an investigation to identify other people who may have been affected.
The first person was diagnosed with tuberculosis last December and two others cases were found in June.
430 students and faculty have received an additional letter asking them to return to the school on Friday, June 21 and June 24-28 for testing.
At this point, the cases are believed to be isolated to Lee High School, which is at 6540 Franconia Road in Springfield, Va.
Symptoms of active tuberculosis disease include a bad cough that lasts three weeks or longer, pain in the chest, coughing up blood or sputum, weakness or fatigue, weight loss, no appetite, chills, fever, and sweating at night.