World’s deadliest disease rips across California as clusters discovered at schools
California health officials are working quickly after tuberculosis exposures were identified at several schools, as cases of the disease continue to rise across the state.
In Fresno County, officials confirmed a cluster at Justin Garza High School. One active case was identified, though it has not been disclosed whether it involves a student or staff member. Authorities stated that no one on campus is currently contagious. Of the 169 people believed to have been exposed, 22 have tested positive for infection but are not showing symptoms.
Health teams are coordinating with the school to carry out contact tracing and testing. Anyone experiencing symptoms has been advised to stay home.
Tuberculosis symptoms can include coughing up blood, a cough lasting longer than three weeks, fatigue, and unintended weight loss. The disease, caused by bacteria that typically affect the lungs, can exist in both active and latent forms.
In a separate case, San Diego County officials reported a possible tuberculosis exposure at Sunset Elementary School in San Ysidro. The potential exposure is believed to have taken place between July 5, 2025, and October 21, 2025.
Health officials are working with the San Ysidro Elementary School District to notify families and staff. Free screenings are being offered to students and employees who may be at higher risk, and those most at risk may have already been contacted. Tuberculosis spreads through the air when a person with an active infection coughs, speaks, sings, or breathes.
County Public Health Officer Sayone Thihalolipavan said symptoms of active tuberculosis include a persistent cough, fever, night sweats, and unexplained weight loss.
Thihalolipavan noted that many people who are exposed do not become sick immediately. This condition, known as latent tuberculosis infection, can develop into active illness later, sometimes years after the initial exposure if left untreated.
For those who believe they may have been exposed, blood tests and skin tests are available to detect infection.
San Diego County has reported a steady increase in tuberculosis cases, rising from 193 cases in 2020 to 265 in 2025.
The recent school exposures add to a growing number of tuberculosis incidents being reported across California.
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