A fourth presumptive case of COVID-19 is confirmed in Pima County this morning, according to a release from Pima County Health Department and the Southern Arizona Veterans Affairs Health Care System. The latest case is a veteran who was hospitalized and tested on Saturday at the Veterans Affairs Health Care System on South Sixth Avenue."A Veteran inpatient presumptively tested positive for Coronavirus (COVID-19) on March 14 at the Southern Arizona VA Health Care System," according to the SAVAHCS press release. "The risk of transmission to other patients and staff is low, as the Veteran is being cared for in respiratory isolation by staff who are specially trained on the Centers for Disease Control treatment guidelines, including the use of personal protective equipment and infection control techniques."This is the second case in Pima County discovered by independent lab testing.The number of presumptive cases in the state that have been discovered through private lab testing jumped from one to six cases in the past 24 hours. Maricopa County saw their numbers double from four cases to eight cases overnight, according to the Arizona Department of Health Services website. The total confirmed and/or presumptive cases in the state rose from 12 cases to 18 cases by Monday morning.We'll continue monitoring the situation and update when more information becomes available.