Coronavirus: US health official warns of dangerous second wave

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A second wave of coronavirus cases in the US could be even worse than the first, the country's top health official has warned.

Centers for Disease Control and Prevention (CDC) director Robert Redfield said the danger was higher as a fresh outbreak would likely coincide with the flu season.

It would put "unimaginable strain" on the US health care system, he said.

The US has seen more than 800,000 cases - the highest in the world.

More than 45,000 people have so far died with coronavirus across the US.

California had its highest one-day rise in new cases on Monday while New Jersey, the worst-hit US state apart from New York, saw its highest increase in deaths in one day.