FILE - This March 12, 2020, file photo, shows the Abraham Lincoln High School in San Francisco. San Francisco City Attorney Dennis Herrera announced last week he was taki...

(AP Photo/Evan Vucci)MEXICO CITY __ Mexican President Andrés Manuel López Obrador posted a video Thursday saying he had tested negative on an antigen test, after testing ...

Teachers unions in many large school districts, including San Francisco, say they won’t go back to classrooms until they are vaccinated. “Not a single San Francisco publi...