Tuberculosis makes a comeback in San Francisco

by Andrea Widburg,American Thinker:

The headline on aSan Francisco news websiteis stunning: “‘This is a big outbreak’: Nearly 1 in 5 affected by TB at SF school.” Certainly, when I was growing up and living in San Francisco, such a headline would have been unimaginable, but now tuberculosis is a growing problem in California, a state with the single largest illegal immigrant population in America.

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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 eitherlatent or active tuberculosisduring an outbreak that started in November.

New testing is scheduled to start today.

In total, 96% of the school community was tested, seven people were diagnosed with active cases during the course of the outbreak and241 latent caseswere reported, according todatareleased by the San Francisco Department of Public Health on April 27 to the school community. (Emphasis mine.)

Tuberculosis remains a problem for California, where cases hit a 12-year high in 2025 with 2,150 reported. The state also had a “substantially higher” rate of disease in 2025 than the U.S. overall, the department said, with 5.4 infections per 100,000 people compared with about 3 per 100,000 nationwide.

The news about Riordan followsreportsfrom last weekthat two California high schools—one in San Diego, in the southernmost part of the state, and one in Fresno, in Central California—had experienced TB outbreaks. TB’s surge in both those regions made sense, given

that they are where most of California’s enormous illegal alien population clusters. And yes, the fact that they’re illegal matters, because it means that they come from impoverished countries rife with disease, enter the U.S. without any medical barriers, and live in densely populated communities. All lawful applicants to America are screened for TB.