The Brief A tuberculosis outbreak at San Francisco's Archbishop Riordan High School has led to the school canceling classes on Friday in addition to offering remote and hybrid learning options. School officials did not indicate there were any additional cases in a letter to the school community on Thursday. A tuberculosis (TB) outbreak at a San Francisco high school has led to the school decision to offer a remote and hybrid learning option as classes are canceled Friday, January 30, a letter from school officials to the school community states. If students have not completed TB testing, they may not participate in indoor activities at this time, school officials said. The Source A letter by Archbishop Riordan President Tim Reardon to the school community and previous KTVU report by Crystal Bailey.