Covid-19 December 30, 2021 4:09 pm San Diego Struggled to Keep Up With Demand for COVID-19 Tests As San Diego County sees COVID-19 positivity rates triple over the last few weeks, the demand for testing has also increased dramatically. NBC 7’s Priya Sridhar reports. US & World Videos 2:41 San Diego lifeguards describe fighting Oceanside Pier fire 2:32 Students and staff confused after the University of Saint Katherine closes abruptly 2:58 NASA researchers aim to enhance safety, flight operations in wildland firefighting 2:47 San Diego welding students recreate replica of historic Black Family Statues 4:29 Escondido woman warned husband may be a killer: Dateline