Jesse Jackson, wife hospitalized with COVID-19

Everyone in Chicago who is 2 years of age and older must wear a face mask indoors starting Friday, regardless of whether they have been vaccinated against COVID-19.

Chicago health officials announced the reinstatement of the indoor mask mandate on Tuesday, after the Windy City saw its daily average of newly diagnosed COVID-19 cases surpass 400 -- a metric that moves the city from "substantial risk" to "higher risk."

"With the highly transmissible delta variant causing case rates to increase, now is the time to re-institute this measure to prevent further spread and save lives," Dr. Allison Arwady, commissioner of the Chicago Department of Public Health, said in a statement. "We continue to track the data closely and are hopeful this will only be temporary and we can bend the COVID curve, as we’ve done in the past."

During a press conference Tuesday, Arwady noted that other COVID-19 metrics, such as the city's test positivity average and hospitalizations, remain at "lower risk."

"A high case count does not automatically translate to a high hospitalization count and a high death count," she told reporters, "and we're hopeful that having the mask in place for everybody will get us through delta while we keep working on getting folks vaccinated."

Masks will be required citywide in all indoor public settings, including bars, restaurants, gyms, hair salons, private clubs and common areas in residential buildings. As with previous mask mandates, the face coverings can be temporarily taken off for certain activities that require their removal, such as eating and drinking or for facials and beard shaves.

Masks can also be removed by employees in settings that are not open to the public, such as office cubicles, so long as the individuals are static and maintaining at least 6 feet from others. The face coverings remain mandatory on public transportation as well as in educational, health care, correctional and congregate settings.

The new mandate does not include capacity limits at public places, and masks will remain optional in outdoor settings.

"We are not anticipating, at this point, adding additional business restrictions. However, we're watching what happens with these metrics," Arwady told reporters. "Our goal is to remain open but careful."

An Alabama doctor is seeing young, healthy patients die from COVID-19 amid the surge of the delta variant.

Dr. Jenna Carpenter, a pulmonary care physician at Marshall Medical South in Guntersville, Alabama, has lost three patients under the age of 40 in the past week from complications related to COVID-19, she told ABC Huntsville, Alabama, affiliate WAAY.

"The young man I lost this week was perfectly healthy," she said. "He wasn't overweight. He did not have any known medical issues and that was a tragedy."

The worst phone call the physicians have to make is to inform family members that their loved one has taken a turn for the worst, Carpenter added.

"In our heart we know this is going to be the last time these folks talk to their families," she said.

The state currently has more ICU patients than beds, and frontline workers are also getting sick from the highly contagious variant, WAAY reported.

"Last week we were down to 35 or 40 ICU beds. Now we are down at the single digits," Dr. Don Williamson, a former state health officer who is now the president and CEO of the Alabama Hospital Association, told the station. "It doesn’t matter if it is six or two, we could even be negative ICU beds."

-ABC News’ Cherise Rudy

Detroit has opened a mass vaccine site for boosters at its convention center.

The TCF Center has played an integral role for Detroit residents during the pandemic, first acting as a mass testing site, a field hospital and eventually a mass vaccination site.

It is currently the only location in the city to get a third booster shot.

-ABC News’ Cherise Rudy

About 20 medical troops, a group that includes doctors, nurses and respiratory therapists, are heading to an overburdened hospital in Lafayette, Louisiana, according to a statement from U.S. Army North, the military's lead organization for national COVID-19 response.

The troops are expected to arrive in the state on Wednesday, a U.S. official told ABC News.

"This is the second time Department of Defense medical assets have deployed to support Louisiana during the pandemic," said Lt. Gen. Laura J. Richardson, commander of U.S. Army North. "While COVID-19 continues to challenge the community here and elsewhere in the U.S., we remain steadfast in our support of our local, state and federal partners."

The military is sending the medical service members after receiving a request for assistance from the Federal Emergency Management Agency, which itself had received a request for help from Louisiana Gov. John Bel Edwards.

-ABC News' Matthew Seyler