U.S. coronavirus deaths topped 42,000 on Monday, according to a Reuters tally, as more protesters gathered in state capitals to demand an early end to the lockdowns, while officials pleaded for patience until more testing becomes available.

Stay-at-home measures, which experts say are essential to slow the spread of the respiratory virus, have ground the economy to a standstill and forced more than 22 million people to apply for unemployment benefits in the last month.

The United States has by far the world's largest number of confirmed coronavirus cases, with more than 774,000 infections, up 20,000 on Monday, with several states yet to report. New reported U.S. cases appear to be slowing from about 30,000 a day last week.