Seven people were diagnosed with active tuberculosis during an outbreak that started in November 2025 at Archbishop Riordan High School in San Francisco. 

New data shows 18%, or nearly 1 in 5, of tested students and staff at Archbishop Riordan High School in San Francisco were diagnosed with either latent or active tuberculosis during an outbreak that started in November. 

New testing is scheduled to start today. 

Article continues below this ad

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. 

In February, four active cases and three suspected active cases were reported. The latest numbers reflect the suspected cases were confirmed to be active TB. The entire school community went through another round of TB testing in March. 

“Data from the March 2026 round of testing indicate a strong reduction in transmission,” the department said in an emailed statement to SFGATE........

© SFGate