This study found that 4.34% of individuals within Los Angeles County, CA had positive antibodies for SARS-COV-2.
- This study performed serologic tests in a community sample to estimate cumulative incidence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection
- Of 1952 individuals invited to participate in antibody testing, 1702 (87.2%) provided consent and 865 (50.9%) were tested, introducing likelihood of selection bias
- Highest rates of positive IgM and IgG were in populations who were male, Black, or had symptoms in the prior 2 months
- The estimate implies that approximately 367 000 adults had SARS-CoV-2 antibodies, which is substantially greater than the 8430 cumulative number of confirmed infections in the county on April 10.