San Joaquin County reported 5 more cases on March 13, increasing the number to 8.[191] The San Joaquin County Department of Public Health declared a Public Health Emergency, causing all schools within the county to close until April 6.[192] Santa Clara County reported 13 more cases, bringing the county's total to 79. Health officials also announced the second coronavirus death in Santa Clara County; the patient was a woman in her 80s who was hospitalized on March 9.[193] In San Jose, a fourth TSA agent at Mineta International Airport tested positive for COVID-19 and two additional firefighters have also tested positive, bringing the total number of San Jose Firefighters with the virus to six. As a result, 70 other firefighters are being monitored after possible exposure to the virus.[193] Stanford University confirmed an undergraduate student has tested positive for the coronavirus; the student is self-isolating.[194] Los Angeles County reported eight new cases, bringing their total to 40.[195] San Diego County reported a total of eleven cases[196][197] Contra Costa County updated their total to 25 cases.[198]