U.S. President-elect Joe Biden has pledged to make controlling the coronavirus a top priority and is likely to push for mask wearing mandates and more fiscal stimulus to keep businesses and workers afloat.

But in the two months until inauguration day on Jan. 20, skyrocketing infections could add more than 8 million more cases and 70,000 deaths, representing a potential 80% increase in infections and a 29% rise in deaths, according to Reuters calculations.

The only ways to change the outcome, experts said, are for President Donald Trump's outgoing administration to alter its strategy or state governments to introduce stricter and more coordinated measures. Colder weather adds to the challenge.