Colorado's first gentleman Marlon Reis, who was diagnosed with the coronavirus last week with his partner Gov. Jared Polis, was hospitalized Sunday after his condition worsened, the governor's office said.

Reis experienced a "slightly worsening cough and shortness of breath," on his eighth day of the virus, according to the governor's office.

Polis drove Reis in his own vehicle to the hospital, according to the governor's office.

"Governor Polis is not experiencing any additional symptoms at this time," the governor's office said in a statement.

-ABC News' Clayton Sandell

The U.S. has hit another record level for coronavirus related hospitalizations, according to the COVID Tracking Project.

There are at least 101,487 Americans hospitalized as of Sunday evening, the tracking project tweeted.

There were over 176,000 new cases and 1,138 new deaths recorded Sunday, according to the health data.

The seven-day average for the tracking project's main metrics also saw new record highs. The seven-day average for new cases was 191,736, for deaths were 2,171 and hospitalizations were 99,939, according to the health data.

The U.S. has now reported over 100,000 cases every day for more than a month straight, and over 200,000 cases for the last three consecutive days, according to health data.

The country reported more than 1.3 million COVID-19 cases in the last week, which is more than any other week on record, the health data showed.

In the last month, the average number of daily cases has doubled. 

The U.S. is currently averaging over 186,793 new coronavirus cases every day, the highest the average has been since the beginning of the pandemic, according to health data.

Since last week, there have been nearly new 15,000 COVID-19 related deaths, with five days over the 2,000 mark, the health data showed.

That is roughly equivalent to 88 COVID-19 related deaths reported every hour. 

The U.S. is currently averaging 2,123 reported COVID-19 deaths a day, that average has increased by 142% since last month, according to the health data.

Hospitalizations continue to surge to unprecedented levels, with over 101,000 patients currently hospitalized with COVID-19 across the country, according to the health data.

Current hospitalizations have nearly doubled in the last month, the health data showed.

-ABC News' Arielle Mitropoulos

Los Angeles County set a new record number of coronavirus cases Sunday, the Health Department said.

The county saw 10,528 new cases and 23 new deaths, according to the Health Department. There are 2,855 people currently hospitalized, the Health Department said.

Los Angeles leads the country with total number of cases, 439,408, and total fatalities, 7,886, according to Johns Hopkins University's Coronavirus Resource Center.

A COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech has been approved for use in the United Kingdom.

The U.K. Department of Health and Social Care announced Wednesday that it has accepted the recommendation from the country's drug regulator to grant a temporary authorization for emergency use of the Pfizer/BioNTech vaccine, called BNT162b2. The Medicines and Healthcare products Regulatory Agency (MHRA) concluded that the vaccine met its standards of safety, quality and effectiveness.

"The vaccine will be made available across the U.K. from next week," a Department of Health and Social Care spokesperson said in a statement, adding that the National Health Service, the publicly-funded healthcare system, "will begin putting their extensive preparations into action to provide care and support to all those eligible for vaccination."

The United Kingdom is the first country in the world to approve the Pfizer/BioNTech vaccine. The companies said in a joint press release Wednesday that they are anticipating further regulatory decisions across the globe in the coming days and weeks and are ready to deliver vaccine doses pending authorizations or approvals.

"Today’s Emergency Use Authorization in the U.K. marks a historic moment in the fight against COVID-19," Pfizer chairman and CEO Albert Bourla said in a statement. "As we anticipate further authorizations and approvals, we are focused on moving with the same level of urgency to safely supply a high-quality vaccine around the world. With thousands of people becoming infected, every day matters in the collective race to end this devastating pandemic."

The MHRA made its recommendation based on a rolling submission, including data from the Phase 3 trial which demonstrated a vaccine efficacy rate of 95%. The Pfizer/BioNTech vaccine was generally well tolerated, with no serious safety concerns reported to date.

Pfizer and BioNTech had already agreed to supply the United Kingdom with 40 million doses of BNT162b2 once authorized for emergency use. Now that the vaccine is authorized, the companies will immediately begin delivering doses, the first of which are expected to arrive on U.K. soil in the coming days. The rest of the doses will arrive in stages, with complete delivery fulfillment expected in 2021, according to the press release.

Pfizer and BioNTech said the distribution of their vaccine in the United Kingdom will be prioritized according to the populations identified in guidance from the Joint Committee on Vaccination and Immunisation, an independent expert group that advises the U.K. government on immunization.

"The Emergency Use Authorization in the U.K. will mark the first time citizens outside of the trials will have the opportunity to be immunized against COVID-19," BioNTech CEO and co-founder Ugur Sahin said in a statement. "We believe that the roll-out of the vaccination program in the U.K. will reduce the number of people in the high-risk population being hospitalized."

The companies have also filed a request for emergency use authorization with the U.S. Food and Drug Administration and have submitted an application for conditional marketing authorization with the European Medicines Agency.