Health Advisory:
Tuberculosis (TB) Outbreak at a Local High
School – Clinical Evaluation and Reporting
January 29, 2026
The San Francisco Department of Public Health (SFDPH) is issuing this health advisory to
inform health care providers of a tuberculosis (TB) outbreak associated with Archbishop
Riordan High School and to outline required evaluation, testing, and reporting guidance
for exposed students and staff.
Situational Update
SFDPH is conducting a large-scale TB contact investigation related to an outbreak at
Archbishop Riordan High School (ARHS) in San Francisco. To date, three cases of active
TB disease have been diagnosed in persons associated with ARHS since November
2025. Additionally, over 50 cases of latent TB infection (LTBI) have been identified within the
school community and efforts are underway to assure preventive treatment for all these
individuals. This health alert aims to notify local pediatric, urgent care and primary care
providers of actions to take to prevent TB in this highly exposed population. At this time, risk to
the general population is low, so these measures are not needed for patients who are not
connected to the AHRS outbrea
