Rev. Jesse Jackson, who spent a week in the hospital while being treated for COVID-19, is now transferred to a rehabilitation facility in Chicago. Meanwhile, Jackson's wife, Jacqueline, has been moved to the intensive care unit after she was also hospitalized with COVID-19 last week, CBS News reports.

The couple's son, Jonathan, said his father's illness has become more complicated because he has also been battling Parkinson's disease since 2015. Jackson, who is now transferred from Chicago's Northwestern Memorial Hospital to The Shirley Ryan AbilityLab,  is expected to immediately begin therapy to treat his Parkinson's disease.

Jacqueline is not placed on a ventilator at the ICU, but she is receiving oxygen treatments to help her breathe on her own. 

"Both of our parents are continuing to receive excellent medical care," Jonathan said. "We urge that you continue to keep them in your prayers because we know this is a serious disease."

Speaking to the Associated Press on Tuesday, Jackson said he is "doing fairly well."

The 79-year-old activist, who is fully vaccinated, received his first dose at a public event in January and encouraged others to do the same. His 77-year-old spouse, however, has not been vaccinated. According to Jackson, Jacqueline didn’t get vaccinated because they were concerned about a “preexisting condition” she has. 

Jackson was also hospitalized early this year for gallbladder surgery. 

"We continue to receive the love that is being poured out to our family from around the world and it is greatly appreciated, as we express our love and concern for the millions of people who have been victimized by the COVID-19 virus and its variants," Jonathan said. "We know this is a dangerous disease so please remain prayerful for all of those who are suffering as a result."

According to Healthline, the U.S. is now seeing 140,000 COVID-19 cases per day. The data also shows that the number of vaccinated people is slowly increasing across the country. Health officials said 99 percent of hospitalizations and deaths from COVID-19 are coming from people who aren’t fully vaccinated. 

“Clearly, some hospitals are seeing their physical resources, as well as their personnel, stretched as they were last winter,” said Dr. William Schaffner, an infectious disease expert from Vanderbilt University in Tennessee. “Seriously ill persons now are younger, and even children’s hospitals are seeing increasing admissions. Delta is seeking out unvaccinated younger adults and children.”