"In total, 96% of the school community was tested, seven people were diagnosed with active cases during the course of the outbreak and 241 latent cases were reported, according to data released by the San Francisco Department of Public Health on April 27 to the school community."
""Data from the March 2026 round of testing indicate a strong reduction in transmission," the department said in an emailed statement to SFGATE Wednesday."
""Every time there's an active case, you start the clock from there in terms of rounds of testing," she told SFGATE in a phone call."
""This is a big outbreak," noted Dr. Monica Gandhi, an infectious disease expert at UC San Francisco."
An outbreak of tuberculosis at Archbishop Riordan High School in San Francisco affected 18% of the tested community, with 241 latent and seven active cases reported. New testing is scheduled, although repeat mass testing is deemed unnecessary. The San Francisco Department of Public Health indicated a reduction in transmission following March testing. TB is a slow-growing disease, and contact tracing is essential after each active case. A TB cluster is defined as four or more active cases.
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