UC San Diego reports surge in coronavirus infections among students since return from holidays UC San Diego says 245 students have tested positive for the COVID-19 coronavirus since Jan. 4. (File) Print UC San Diego says 245 of its students have tested positive for the COVID-19 coronavirus since the winter quarter began Jan. 4 — the kind of surge the university avoided last fall through a major testing and education campaign called “Return to Learn.” University data show that 109 of those students live at UCSD, which has one of the most comprehensive coronavirus testing programs in academia. The 136 other students are living off campus in the San Diego area. UCSD also said that 61 of its employees have tested positive for the virus.