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nbsp;"We found that many people possessed antibodies that could bind to SARS-CoV-2 before the pandemic, but these antibodies could not prevent infections," said study leader Scott Hensley, an associate professor of microbiology at the University of Pennsylvania's School of Medicine, in a statement. black bike bell nbsp;BIDEN'S CABINET PICKS: FULL LIST In tapping the Connecticut commissioner, Biden passed over two high-profile teachers union representatives -- Lily Eskelsen Garcia, former president of the National Education Association, and Randi Weingarten, president of the American Federation of Teachers. black bike bell Successive waves of hospitalization and death in Western countries last year show the disease can cause significant illness even when relatively small numbers of people are exposed, said Martin Hibberd, professor of emerging infectious disease at the London School of Hygiene and Tropical Medicine. black bike bell A July report from the Partnership of New York City found that "as many as a third of the 230,000 small businesses that populate neighborhood commercial corridors may never reopen" as a result of pandemic-related shutdowns, noting that the unemployment rate in the city had risen to 18.3% at the time. black bike bell