Antibody Tests Reveal Wider COVID Exposure in L.A. County

New antibody testing of L.A. County residents shows coronavirus has been more widespread than previously assumed. The results of the study conducted by the University of Southern California and the Los Angeles County Department of Public Health are similar to a study of Santa Clara County residents by Stanford.

900 people were tested. Based on those results, the researchers estimate that as many as 442,000 people throughout the county (5.6%) had contracted coronavirus as of April 9. That would be 55 times higher than official numbers and would suggest the county's mortality rate is around 0.1% or 0.2%.

The study has not yet undergone a peer review and the researchers could not say for certain whether those with antibodies are immune from the virus.

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