LOS ANGELES — As Los Angles County reaches over 9,000 reported COVID-19 cases and nearly 300 deaths, a huge unknown remains here and across the nation: How bad is it? With a population of 10 million, larger than those of more than 40 states, the county is a prime location to launch a large-scale study that aims to answer that question and learn more about antibodies that could potentially provide immunity from COVID-19, the disease associated with the coronavirus, according to public health and policy experts.

 

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