Cashier George Wallace, of Quincy, Mass., center, works while standing behind a plastic shield, at the checkout in a grocery store, in Quincy, Mass. Grocery stores across the U.S. are installing protective plastic shields at checkouts to help keep cashiers and shoppers from infecting each other with the coronavirus. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death
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