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50-80 fold higher infections than previously reported in Santa Clara county...

COVID-19 Antibody Seroprevalence in Santa Clara County, California

https://www.medrxiv.org/content/10.1101/2020.04.14.20062463v1

We report the prevalence of antibodies to SARS-CoV-2 in a sample of 3,330 people, adjusting for zip code, sex, and race/ethnicity. We also adjust for test performance characteristics using 3 different estimates: (i) the test manufacturer's data, (ii) a sample of 37 positive and 30 negative controls tested at Stanford, and (iii) a combination of both.

These prevalence estimates represent a range between 48,000 and 81,000 people infected in Santa Clara County by early April, 50-85-fold more than the number of confirmed cases.