The global spread of the novel coronavirus is accelerating rapidly, with cases of infection doubling in a week to top 300,000 Sunday, pointing to the increasing challenges for governments world-wide as they lock down more people and shut borders.

Cases in the U.S. alone crossed 26,000, as President Trump declared a major disaster in New York state and considered similar declarations for California and other hard-hit states. The governor of Hawaii announced a mandatory two-week self-quarantine for all arrivals.

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