Maybe, but that would seem to be an awful lot of previous SARS, MERS infections in that area. Am trying to find the report that CNBC references.
Press release “USC-LA County Study: Early Results of Antibody Testing Suggest Number of COVID-19 Infections Far Exceeds Number of Confirmed Cases in Los Angeles County
“
- see http://publichealth.lacounty.gov/phcommon/public/media/mediapubhpdetail.cfm?prid=2328
“LAC DPH Health Advisory: SARS-CoV-2 Serology”
- see http://publichealth.lacounty.gov/eprp/lahan/alerts/LAHANCOVID041620.pdf