Antibody

People wear their face masks waiting in line for an emergency food distribution at the 88th Street Temple Church of God in Christ on April 14, 2020 in Los Angeles, California, during the coronavirus pandemic.Frederic J. Brown | AFP | Getty ImagesThe Covid-19 outbreak in Los Angeles County is likely far more widespread than previously thought, up…

A new study conducted by the University of Southern California along with the LA County Department of Public Health indicates the presence of antibodies for COVID-19 in between 2.8 and 5.6% of the population of LA County, suggesting that between 221,000 and 442,000 individuals had the infection — up to 55 times more people than…

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A law firm in Scottsdale, Arizona, tested employees who hoped, with the prick of a finger, to learn if they might be immune. In Laredo, Texas, community leaders secured 20,000 of the new tests to gauge how many residents had been infected. In Chicago, a hospital screened firefighters to help determine whether they could safely…

Covid-19 diagnostic tests from scaling up adequately.As President Trump presses to reopen the country and several states are considering lifting lockdowns in the next few weeks, widespread screening is considered critical. On Friday, Mr. Trump cheered the F.D.A.’s emergency approval of some antibody tests, saying they would support efforts to get Americans back to work…