It comes as the Centers for Disease Control (CDC) for the first time urged “universal mask use” indoors, unless when Americans are at their own home.
The CDC said the US had “entered a phase of high-level transmission” of the virus.
It has confirmed 14.3 million cases and more than 278,000 deaths.
Mr Biden – who is due to take office on 20 January – also said he expected his inauguration to be a scaled-back event without large crowds because of coronavirus concerns.”My guess is there’ll still be a platform ceremony but I don’t know how it’s all going to work out,” he said.