The Brief
- Students, faculty and staff at Archbishop Riordan High School are undergoing a new round of tuberculosis testing.
- Previous tests showed nearly one in five tests came back positive, though many of those cases were dormant.
- The school’s outbreak began in November, 2025.
SAN FRANCISCO, Calif. – Nearly one in five students and staff at San Francisco’s Archbishop Riordan High School have been diagnosed with latent or active tuberculosis, the latest development in an outbreak that started in November.
On Wednesday, the school started a new round of testing, which will be completed on Friday, according to an April 27 letter from the school and the San Francisco Department of Public Health. Testing will be handled by SFDPH and Kaiser, respectively.
Testing will focus on students, faculty and staff who have been exposed to a recently confirmed case, or who are part of a small group of individuals who had previously tested positive for latent tuberculosis, a dormant form of TB.
Falling numbers
What they’re saying:…