President Donald Trump's doctors said he has "responded extremely well to treatment" for COVID-19 and should be able to return to public engagements on Saturday, according to a memo released Thursday evening.

"Since returning home, his physical exam has remained stable and devoid of any indications of illness," Dr. Sean Conley wrote. "Overall he's responded extremely well to treatment, without evidence on examination of adverse therapeutic effects."

The doctor also said Trump should be able to return to the campaign trail on Saturday. Trump had fought for an in-person debate with former Vice President Donald Trump this week, but the Commission on Presidential Debates decided to make the event virtual and Trump said he would not participate.

"Saturday will be day 10 since Thursday's diagnosis, and based on the trajectory of advanced diagnostics the team has been conducting, I fully anticipate the President's safe return to public engagements at that time," Conley wrote.

The Trump campaign had canceled all of Trump's events when he was diagnosed with COVID-19. It has not yet announced when he will return to the campaign trail

Ohio reported 1,539 new coronavirus cases on Thursday, in what the governor called the continuation of a “concerning upward trend.”

“Ohio’s positivity rate has jumped to 3.9% and the 7-day rolling average is 3.3%,” Gov. Mike DeWine tweeted. “This reflects the ongoing increasing trend of virus spread that we are seeing throughout the state. These numbers are not good.”

Thirteen more deaths were reported in the last 24 hours, bringing the state’s fatality total to 4,983, according to numbers released by the governor. Over 164,000 people in Ohio have been diagnosed with COVID-19.

The World Bank has warned that 150 million people could fall into "extreme poverty" by the end of 2021, due to the coronavirus pandemic and accompanying worldwide recession with the levels of poverty set to rise for the first time in 20 years.

In its biennial report on poverty and shared prosperity, the World Bank estimates between 9.1% and 9.4% of the global population would be affected by extreme poverty, which the multilateral development lender defines as living on under $1.90 a day. Had the pandemic not hit, the rate was forecast to fall to 7.9% this year.

"In order to reverse this serious setback to development progress and poverty reduction, countries will need to prepare for a different economy post-COVID, by allowing capital, labor, skills and innovation to move into new businesses and sectors," World Bank president David Malpass said in a statement Wednesday.

While extreme poverty rates are on the rise, around a quarter of the world's population live on less than $3.20 per day and more than 40% live on $5.50.

Overall, levels of extreme poverty have been steadily declining over the past quarter of a decade. Some 1.9 billion people lived in extreme poverty in 1990, compared to 689 million in 2017, according to the World Bank. In addition to the coronavirus pandemic, the report cites military conflict and climate change as two significant factors behind the recent reversal.

Extreme poverty is usually most keenly felt in rural areas, but that is now spreading to urban hubs. Around 82% of the number of people forecast to slide into extreme poverty will be living in middle-income countries, according to the report.

ABC News' Guy Davies contributed to this report.

Another 840,000 Americans sought unemployment insurance last week, according to the latest report from the U.S. Department of Labor released Thursday.

This week's claims do not include the most up-to-date data from California, which has temporarily stopped accepting new jobless claims in order to work through a backlog and implement fraud prevention technology, the department said. Instead, the figure from California will reflect the level reported during the week prior to the pause in new applications.

Still, the initial claims data reflect a labor market still suffering some six months into the coronavirus pandemic. This is the 29th straight week of weekly unemployment claims coming in above the pre-pandemic record set in 1982.

While the number of new claims has dropped slightly since peaking in late March, they have stagnated at unprecedented levels not seen prior to the COVID-19 crisis. The average for the past four weeks was 857,000 new claims per week, according to the U.S. Department of Labor.

ABC News' Catherine Thorbecke contributed to this report.