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Riordan High TB Outbreak: 219 Positive Tests as School Cleared to Resume Classes

Health officials say a safe return to campus follows expanded testing with treatment underway.

San Francisco health officials said Friday they believe they have identified all cases in a recent tuberculosis outbreak at Archbishop Riordan High School that could potentially transmit to others and are well on their way to resolving the outbreak.
San Francisco health officials have identified more than 200 latent cases of tuberculosis associated with an outbreak at Archbishop Riordan High School that was first reported in November.
A three-story building with "Archbishop Riordan High School" on the facade, featuring accessible parking spaces and trimmed trees in front.
In-person classes are safe to resume at a San Francisco high school after tuberculosis was late last year.

Overview

  • San Francisco health officials report 219 positives out of 1,261 students and staff, with 204 confirmed as latent tuberculosis so far.
  • Three additional suspected active cases are pending lab confirmation after symptoms, positive blood tests, and abnormal chest X-rays were identified.
  • All confirmed and suspected active cases are on therapy, and officials say those on effective treatment are not contagious.
  • Following a TB clearance process that tested nearly all students and all staff, the campus was deemed safe, with full in-person classes expected to resume Monday.
  • Latent TB is not contagious; preventive antibiotics are strongly recommended and can reduce the risk of future active disease by about 90%, and no related active cases have been reported at other San Francisco schools.