Something unusual happened at Archbishop Riordan High School last fall.
In September, a student in the Bay Area school went to see a health care provider for a cough that wouldn’t go away. But it wasn’t until two months later that the student got diagnosed: tuberculosis. The San Francisco Department of Public Health (SFDPH) launched an investigation, which revealed a surprisingly high rate of latent tuberculosis — meaning that people were infected by the Mycobacterium tuberculosis bacteria, but their infections had not yet progressed to active and contagious disease — at the school.
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