The worldwide Covid-19 death toll is now above 250,000, according to Johns Hopkins University.
Nigeria, India and Israel are among the latest countries to start easing restrictions.
New Zealand prime minister discusses "Trans-Tasman travel bubble" with Australian cabinet.
Later on Tuesday, the UK is to begin testing a new contact-tracing app on the Isle of Wight.
The US records 1,015 virus deaths in 24 hours, the lowest one-day tally in a month.
The number includes those who have died with the virus and not necessarily because of it.
The US Treasury will borrow a record $3tn (£2.4tn) between April and June.
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