The United States will remain a member of the World Health Organization, Dr. Anthony Fauci, the nation's top infectious disease expert, announced Thursday.

Fauci, director of the U.S. National Institute of Allergy and Infectious Diseases, made the announcement via video link to the WHO's executive board in Geneva, a day after Joe Biden was sworn-in as the 46th president of the U.S.

"I am honored to announce the United States will remain a member of the World Health Organization," Fauci told the board Thursday, adding that the U.S. will also "fulfil its financial obligations" to the WHO and stop reducing its staff at the United Nations agency..

Fauci, who is Biden's chief medical adviser on the coronavirus pandemic, also announced that the president will issue a directive Thursday that shows the country's intent to join the COVAX Facility, a global initiative to ensure rapid and equitable access to COVID-19 vaccines for all countries regardless of income.

Within hours of becoming president, Biden had signed an executive order reversing former President Donald Trump's decision to withdraw from the WHO. Trump had accused the organization of failing to correctly respond to the coronavirus pandemic and of allegedly giving too much power to China.

There were 178,255 new cases of COVID-19 confirmed in the United States on Wednesday, according to a real-time count kept by Johns Hopkins University.

The latest daily case count is far less than the country's all-time high of 298,031 newly confirmed infections on Jan. 2, Johns Hopkins data shows.

An additional 4,231 fatalities from COVID-19 were registered nationwide on Wednesday, just under the peak of 4,462 new deaths on Jan. 12, according to Johns Hopkins data.

COVID-19 data may be skewed due to possible lags in reporting over the holiday weekend and earlier holidays.

A total of 24,438,720 people in the U.S. have been diagnosed with COVID-19 since the pandemic began, and at least 406,147 have died, according to Johns Hopkins data. The cases include people from all 50 U.S. states, Washington, D.C., and other U.S. territories as well as repatriated citizens.

Much of the country was under lockdown by the end of March as the first wave of pandemic hit. By May 20, all U.S. states had begun lifting stay-at-home orders and other restrictions put in place to curb the spread of the novel coronavirus. The day-to-day increase in the country's cases then hovered around 20,000 for a couple of weeks before shooting back up over the summer.

The numbers lingered around 40,000 to 50,000 from mid-August through early October before surging again to record levels, crossing 100,000 for the first time on Nov. 4, then reaching 200,000 on Nov. 27 before nearing 300,000 on Jan. 2.

Rochelle Walensky, the new director of the Centers for Disease Control and Prevention who began her role after U.S. President Joe Biden's inauguration Wednesday, released a statement saying she is extending the eviction ban due to the ongoing COVID-19 pandemic.

"As a protective public health measure, I will extend the current order temporarily halting residential evictions until at least March 31, 2021," she said in the statement. "The COVID-19 pandemic has presented a historic threat to our nation’s health. It has also triggered a housing affordability crisis that disproportionately affects some communities."

She said that as cases continue to rise, it's important to "keep people in their homes and out of congregate settings — like shelters — where COVID-19 can take an even stronger foothold."

An additional 450 deaths from COVID-19 were reported in Texas on Wednesday, marking a new record for the Lone Star State, according to data from the Texas Department of Health.

There were also 25,512 newly confirmed cases of COVID-19 and 5,017 probable cases reported Wednesday.

The cumulative totals now stand at more than 2.1 million confirmed and probable cases, including at least 32,844 deaths, according to the state health department data.

There have now been more than 20 million vaccine doses given out in the U.S., the CDC reported on Saturday.

The milestone was reached 23 days after the goal set by former President Donald Trump administration's Operation Warp Speed to reach that number of doses by the end of 2020.

President Joe Biden's administration has pledged to distribute 100 million doses in the first 100 days, as well as ramp up production of materials to administer vaccines amid an increase in demand and shortages of supply at the state level.

-ABC News' Ahmad Hemingway contributed to this report.