File photo: CGTN

The U.S. reported more than 50,000 new confirmed COVID-19 cases on Wednesday. 

This is the largest single-day surge since the outbreak started in the U.S.

Many states are seeing increases in virus infections, with some reversing or pausing their phased reopening. 

According to a New York Times analysis, at least six states are reversing their plans and 13 states are pausing their reopening. 

California Governor Gavin Newsom ordered businesses with indoor spaces to close immediately in several counties.

This includes restaurants, museums and movie theaters. 

New York City Mayor Bill de Blasio issued a similar order. 

NYC restaurants were supposed to reopen indoor dining on July 6th but will instead remain closed. 

Some cities, such as Jacksonville, Florida, have reversed previous policies on facemasks, making them mandatory to wear in public. 

During a Congressional hearing this week, the U.S.'s top infectious disease expert, Dr. Anthony Fauci, warned new COVID-19 infections could reach 100,000 a day if the virus is not contained.

Former Food and Drug Administration (FDA) Commissioner Dr. Scott Gottlieb, told CNBC during an interview, "We're well more than 100,000 cases a day right now." 

Gottlieb says the U.S. still isn't testing enough people for COVID-19 and states with severe hotspots, such as Florida and Texas, are falling behind because testing distribution is uneven across the state. 

Health experts say the next two weeks will be critical in fighting and containing COVID-19.