Coronavirus updates: 84% of California population to go on lockdown Sunday night

There were 157,901 new cases of COVID-19 confirmed in the United States on Monday, according to a real-time count kept by Johns Hopkins University.

It's the 28th straight day that the country has reported over 100,000 newly diagnosed infections. Monday's count is down from a peak of 205,557 new cases last Friday.

An additional 1,172 fatalities from COVID-19 were also registered nationwide on Monday, less than the all-time high of 2,609 new deaths on April 15.

COVID-19 data may be skewed in the coming days and weeks due to possible lags in reporting over Thanksgiving followed by a potentially very large backlog from the holiday.

A total of 13,545,017 people in the United States have been diagnosed with COVID-19 since the pandemic began, and at least 268,087 of them have died, according to Johns Hopkins. 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 and reaching 200,000 for the first time on Nov. 27.

The United States saw another record day of COVID-19 hospitalizations, according to the COVID Tracking Project, a volunteer-run effort to track the U.S. outbreak.

The group said the country currently has 96,039 people hospitalized with the disease, with a seven-day average of 91,331.

"Hospitalizations have doubled since November 1 and tripled since October 1. We should see 100k hospitalizations in the next couple of days," The COVID Tracking Project wrote on its Twitter account Monday night.

The group called November the "worst month of the pandemic outside of April," as the nation recorded a record 4.28 million new cases of COVID-19, over 72,000 new hospitalizations and 36,256 new deaths.

President Donald Trump’s coronavirus adviser Dr. Scott Atlas resigned on Monday.

Atlas, a neuroradiologist with no background in infectious diseases who had supplanted Dr. Anthony Fauci and other top federal public health officials as one of Trump's top medical advisers, was reaching the end of his 130-day term as a “special government employee,” according to the official.

Fox News, where Atlas first caught Trump’s eye before the president appointed him to a paid advisory role in the White House, initially reported the news.

Atlas spoke with the president Monday, a White House official confirmed to ABC News.

Atlas did not respond to a request for comment.

-ABC News' Ben Gittleson

Miami-Dade County Mayor Daniella Levine Cava, who assumed office less than two weeks ago, announced Monday that she has tested positive for the coronavirus.

Her husband, Dr. Robert Cava, also tested positive and was exposed to the virus by one of his patients last Wednesday, according to the mayor. The couple is currently quarantining, the mayor said.

"We both remain in good spirits and are fortunate to have only mild symptoms at this time," Mayor Cava said in a statement.

Cava, a former Miami-Dade County district commissioner, was elected as the city's first female mayor on Election Day and assumed office on Nov. 17.

The county has over 229,000 total COVID-19 cases and at least 3,835 total deaths, according to the Florida Health Department.