Capt. Sir Thomas Moore, the 100-year-old British World War II veteran who garnered global attention for his fundraising efforts amid the pandemic, has been hospitalized with COVID-19, according to his daughter.

"Over the last few weeks he was being treated for pneumonia and last week tested positive for COVID-19," his daughter, Hannah Ingram-Moore, said in a statement posted on Twitter Sunday. "He was at home with us until today when he needed additional help with his breathing. He is being treated in a ward, although he is not in ICU."

Ingram-Moore thanked health workers for the "remarkable" care her father has received in recent weeks.

"We know that the wonderful staff at Bedford Hospital will do all they can to make him comfortable and hopefully return home as soon as possible," she added.

Last spring, Moore raised over 37 million pounds ($50.7 million) for the United Kingdom's National Health Service by walking laps in his garden in England amid a nationwide lockdown. Queen Elizabeth II honored Moore's charity and service to the country with a promotion to honorary colonel, a social flyover and knighthood.

There were 111,896 new cases of COVID-19 confirmed in the United States on Sunday, according to a real-time count kept by Johns Hopkins University.

Sunday's case count is the lowest the country has recorded since Dec. 25 and is also far less than the all-time high of 300,282 newly confirmed infections on Jan. 2, Johns Hopkins data shows.

An additional 1,794 fatalities from COVID-19 were registered nationwide on Sunday, down from a peak of 4,466 new deaths on Jan. 12, according to Johns Hopkins data.

COVID-19 data may be skewed due to possible lags in reporting over the Martin Luther King Jr. Day holiday weekend.

A total of 26,187,424 people in the U.S. have been diagnosed with COVID-19 since the pandemic began, and at least 441,331 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 topping 300,000 on Jan. 2.

So far, the U.S. Food and Drug Administration has authorized two COVID-19 vaccines for emergency use -- one developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and another developed by American biotechnology company Moderna and the National Institute of Allergy and Infectious Diseases. More than 32 million vaccine doses have been administered nationwide, according to the latest data from the Centers for Disease Control and Prevention.

The number of cases, hospitalizations and deaths are continuing to decline nationwide, according to a new report by the U.S. Department of Health and Human Services.

There has been a four-week downward trend of reported COVID-19 cases – resulting in a 50% decline since the peak on Jan. 8.

However, the rates of adult occupancy in intensive care units remain high in several states, the report found.

So far, 39,037,964 vaccine doses have been administered, with 9% of the population (30.3 million people) having received one or more doses and 3% of the population (8.3 million people) having received two doses.

Since President Joe Biden was sworn in on Jan. 20, 22,512,683 doses have been administered toward his 100 million goal.

ABC News’ Josh Margolin and Arielle Mitropoulos contributed to this report.