{"id":78,"date":"2026-05-08T04:32:07","date_gmt":"2026-05-08T04:32:07","guid":{"rendered":"https:\/\/sanfranciscomovingguide.com\/?p=78"},"modified":"2026-05-08T04:32:07","modified_gmt":"2026-05-08T04:32:07","slug":"this-is-a-big-outbreak-nearly-1-in-5-affected-by-tb-at-sf-school","status":"publish","type":"post","link":"https:\/\/sanfranciscomovingguide.com\/?p=78","title":{"rendered":"&#8216;This is a big outbreak&#8217;: Nearly 1 in 5 affected by TB at SF school"},"content":{"rendered":"<article>\n<div><\/div>\n<div>\n<p>New data shows 18%, or nearly 1 in 5, of tested students and staff at Archbishop\u00a0Riordan High School in San Francisco were diagnosed with either\u00a0latent or active tuberculosis during an outbreak that started in November.\u00a0<\/p>\n<p>Read more <a href=\"https:\/\/sanfranciscomovingguide.com\/?p=76\">iPhone users could get up to $95 per device in $250M Apple settlement<\/a><\/p>\n<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" alt=\"\" aria-hidden=\"true\" class=\"x1px y1px vh abs\" height=\"1\" src=\"https:\/\/cdn-channels-pixel.ex.co\/events\/0012000001fxZm9AAE?integrationType=DEFAULT&amp;template=design%2Farticle%2Fplatypus_two_column.tpl\" width=\"1\"\/><\/div>\n<div>\n<p>New testing is scheduled to start today.\u00a0<\/p>\n<\/div>\n<div><\/div>\n<div>\n<p>In total, 96% of the school community was\u00a0tested, seven people were diagnosed with active cases during the course of the outbreak and 241 latent cases were reported, according to \u00a0released by the San Francisco Department of Public Health on April 27 to the school community.\u00a0<\/p>\n<\/div>\n<div>\n<p>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.\u00a0<\/p>\n<\/div>\n<div>\n<p>\u201cData from the March 2026 round of testing indicate a strong reduction in transmission,\u201d the department said in an emailed statement to SFGATE Wednesday. \u00a0\u00a0<\/p>\n<\/div>\n<div>\n<p>The department also stressed that \u201crepeat mass testing at the school is no longer required.\u201d They said the new testing is \u201cout of an abundance of caution\u201d and only for those who had a recent exposure to a confirmed case or were part of a \u201csmall group of individuals with new latent TB cases\u201d found during the March testing.\u00a0<\/p>\n<\/div>\n<div><\/div>\n<div>\n<p>Dr. Monica Gandhi, an infectious disease expert at UC San Francisco, explained that TB is a slow-growing disease, which means testing may not start for eight to 10 weeks after an exposure to active TB.\u00a0<\/p>\n<\/div>\n<div>\n<p>\u201cEvery time there\u2019s an active case, you start the clock from there in terms of rounds of testing,\u201d she told SFGATE in a phone call. \u201cIf that person was at school, then everyone around them needs contact tracing and testing again.\u201d<\/p>\n<\/div>\n<div>\n<p>Gandhi noted that the California Department of Public Health defines a TB cluster as being four or more active cases.<\/p>\n<\/div>\n<div><\/div>\n<div>\n<p>\u201cThis is a big outbreak,\u201d she told SFGATE of the seven active cases reported.<\/p>\n<\/div>\n<div>\n<p>Tuberculosis, an ancient bacterial disease that dates back 9,000 years, can be either active or latent, according to the U.S. Centers for Disease Control and Prevention. When it\u2019s active, the disease can be transmitted and also cause symptoms like cough, fever and weight loss. In latent form, it won\u2019t cause symptoms or be transmitted. However, the disease can turn into an active case at any time, even decades after the initial infection.<\/p>\n<p>Read more <a href=\"https:\/\/sanfranciscomovingguide.com\/?p=74\">7 months after last layoffs, Bay Area biotech giant Gilead does another round<\/a><\/p>\n<\/div>\n<div>\n<p>Both active and latent TB can be treated with an antibiotic treatment that typically takes months.<\/p>\n<\/div>\n<div>\n<p>While latent TB doesn\u2019t result in symptoms, Gandhi said it was unusual to see such a high percentage of the school population be diagnosed with the condition.<\/p>\n<\/div>\n<div><\/div>\n<div>\n<p>\u201cKids in this country do not have latent TB like that,\u201d she said. \u201cThose kind of numbers, of 20% having latent TB, are in low-income countries.\u201d\u00a0<\/p>\n<\/div>\n<div>\n<p>Requests for further comment from Archbishop Riordan High School were not answered by the time of publication.<\/p>\n<\/div>\n<div>\n<p>The \u00a0California Department of Public Health noted that the last time an infectious person was on campus was Feb. 19. As of March 9, only students who had been tested for TB and \u201chave TB clearance on file with the school\u201d are allowed on campus or at off-campus school events. The department said 95% of those diagnosed at the school with latent TB are undergoing or have finished treatment, and all of those who had been diagnosed with active TB were being treated.<\/p>\n<\/div>\n<div><\/div>\n<div>\n<p>Tuberculosis remains a problem for California, where cases hit a 12-year high in 2025 with 2,150 reported. The state also had a \u201csubstantially higher\u201d rate of disease in 2025\u00a0than the U.S. overall, the department said, with 5.4 infections per 100,000 people compared with about 3 per 100,000 nationwide.<\/p>\n<\/div>\n<div>\n<div>\n<div>More News<\/div>\n<\/div>\n<div>\n<p>\u2014 Philippine Consulate concerned over raid on Disney cruise in Calif.<br \/>\u2014 &#8216;This is a big outbreak&#8217;: Nearly 1 in 5 affected by TB at SF school<br \/>\u2014 Pest that leaves unsightly &#8216;sugar volcanoes&#8217; trashing Calif. home values<br \/>\u2014 The heavily congested Calif. highway now controlled by AI<\/p>\n<p>Read more <a href=\"https:\/\/sanfranciscomovingguide.com\/?p=72\">A pest that leaves unsightly \u2018sugar volcanoes\u2019 is trashing Calif. home values<\/a><\/p>\n<\/div>\n<div>\n<p><em>Sign up for\u00a0daily SFGATE breaking news alerts here.<\/em><\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>New testing is starting at Archbishop Riordan High School as officials work to keep tuberculosis cases from spreading again.<\/p>\n","protected":false},"author":1,"featured_media":77,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-78","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interesting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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