Coronavirus Update: Biden, Trump Contrast in Style; Wuhan Tests Nine Million

President Trump and presumptive Democratic nominee Joe Biden approach Memorial Day differently; Pharmaceutical giant Merck makes deals for vaccines; Wuhan, China, says it has tested more than nine million people in 10 days. WSJ’s Shelby Holliday has the latest on the pandemic. Photos: Evan Vucci and Patrick Semansky/Associated Press

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