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The number of confirmed US coronavirus cases soared past 500 including two further deaths.
The surge came as medics headed to a cruise ship off the California coast to prepare passengers for landfall, and Senator Ted Cruz went into self-quarantine after shaking hands with an infected person.
Some 30 US states have been hit by the novel coronavirus, with Oregon the latest to declare an emergency, and 60 million people in California and New York under crisis measures.
Two more deaths linked to a virus-hit care home near Seattle were reported bringing the nationwide toll to at least 21.
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