The US has more than 200,000 cases of coronavirus. And carriers who don't feel sick are fueling the spread

The number of US coronavirus cases surged by more than 14,000 in just a few hours Wednesday as the death toll topped 4,400.

As of Wednesday afternoon, more than 210,000 people in the United States have been infected, and at least 4,669 have died.

Now, more data showing people without symptoms are fueling the spread has top officials rethinking whether the general public should be wearing masks.

New data from Iceland shows 50% of those who tested positive said they were asymptomatic.

In the US, an estimated 25% of coronavirus carriers have no symptoms, said the director of the Centers for Disease Control and Prevention.