• Global death toll rises to at least 638 as confirmed cases reach more than 31,000 in mainland China
• 8 Americans diagnosed with virus on cruise ship quarantined in Japan
• 27 cruise passengers screened in New Jersey
• Chinese commission sends investigators after death of doctor punished after raising alarm
• President Xi Jinping urges U.S. to respond to outbreak in “reasonable way”
• Two more State Department-chartered evacuation flights leave Wuhan for U.S.
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