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PHILADELPHIA — Mayor Jim Kenney kicked off a recent briefing on Philadelphia’s coronavirus response with an unusual request for residents: Be careful what you flush. Between mid-March, when the city’s stay-at-home order was issued, and the end of April, most …

NEW YORK — U.S. employers have cooled to the idea of testing workers for possible immunity to the coronavirus as they prepare to reopen factories and other workplaces. Blood tests that check for antibodies to the new coronavirus have been …