Nearly 9 million Americans had been given their first Covid-19 vaccination dose as of Jan. 11, the U.S. Centers for Disease Control and Prevention said, as states scrambled to step up inoculations that have yet to slow the roaring pandemic.

More than two-thirds of the 15 million coronavirus vaccines shipped within the United States have gone unused, U.S. health officials said on Jan. 4, as the governors of New York and Florida vowed to penalize hospitals that fail to dispense shots quickly.

Initially traced to about 100 cases of Covid-19 that spread across the United States, the number of infections linked to a Biogen corporate conference held in February 2020 at the Boston Marriott Long Wharf Hotel has grown exponentially and researchers estimate the total could be as many as 300,000.

The number of new Covid-19 cases in the United States hit another record high, rising 18% week-over-week to more than 575,000, while deaths inched up 3%, according to a Reuters analysis of state and county reports.

The United States set a new all-time high for coronavirus cases confirmed in a single 24-hour period, reporting just over 100,000 new infections to surpass the record total of 91,000 posted a day earlier, according to a Reuters tally.

U.S. coronavirus cases crossed the 9 million mark, rising by 1 million in two weeks as the world’s worst-affected country faces a resurgence in the pandemic just ahead of elections.

The number of new Covid-19 cases in the United States last week rose 24% to more than 485,000 while the number of tests performed rose 5.5%, according to a Reuters analysis of state and county reports.

The number of novel coronavirus cases in the United States topped 7 million – more than 20% of the world’s total – as Midwest states reported spikes in Covid-19 infections in September, according to a Reuters tally.

The death toll from the spread of the coronavirus in the United States exceeded 200,000, by the far the highest number of any nation.

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.