Over 50 individuals at the Catholic high school have latent tuberculosis, while at least three have active, contagious forms of the disease.
In-person learning has been replaced by remote study until February 9, followed by a hybrid model until February 20, after which only those with negative test results can return to campus.
The first active case was reported in November, prompting ongoing testing and a health advisory from the San Francisco Department of Public Health.
Although California has a higher TB incidence rate than the national average, health officials state the risk to the general population from this outbreak is low.
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