The global death toll from Covid-19 could double to 2 million before a successful vaccine is widely used and could be even higher without concerted action to curb the pandemic, an official at the World Health Organization said.

U.S. deaths from the coronavirus will reach 410,000 by the end of 2020 and deaths could soar to 3,000 per day in December, the University of Washington’s health institute forecast.

The global death toll from the coronavirus surpassed 800,000 according to a Reuters tally, with the United States, Brazil and India leading the rise in fatalities.

The U.S. death toll from Covid-19 fell 16% to about 7,200 people last week, the first decline in deaths after four weeks of increases, according to a Reuters tally of state and county reports.

Global coronavirus cases pushed past 20 million, according to a Reuters tally, with the United States, Brazil and India accounting for more than half of all known infections.

Americans sunbathed on beaches, fished from boats and strolled on boardwalks this holiday weekend, but the occasional person wearing a mask was a constant reminder that the world is still battling the coronavirus pandemic.

The United Kingdom’s COVID-19 death toll exceeds 40,000, by far the worst yet reported in Europe, raising more questions about Prime Minister Boris Johnson’s handling of the coronavirus crisis.