A few days after preliminary results from a large-scale antibody study in Santa Clara County suggested coronavirus infections in the county are underreported by a factor as large as 50 to 85, results from a newly-released antibody study conducted in Los Angeles County contained similar findings. The L.A. antibody study was conducted by the University of Southern California and the Los Angeles County Department of Public Health. Unlike the Stanford study, where participants were recruited via Facebook ads, participants in the Los Angeles County were recruited by market services firm LRW Group, which used a large proprietary database to create a random sample of the county population. Of the 1,000 individuals tested in early April, 4.1 percent were found to have COVID-19 antibodies. When adjusting for statistical margin of error, the study finds that 2.8 percent to 5.6 percent of the county's adult population has already been infected, which translates to 221,000 to 442,000 people. If infections are this vastly underreported, then the mortality rate of COVID-19 is substantially lower than current estimates. The Stanford researchers ... projected deaths through April 22 and divided that figure by the number of infections to calculate a "true" mortality rate of .12 to .20 percent when using the weighted figures. Using the unweighted numbers ... one gets a "true" mortality rate of .35 percent, a number almost identical to the mortality rate calculated following antibody tests in a hard-hit German town.