The Centers for Disease Control and Prevention acknowledged Monday that people can sometimes be infected with the coronavirus through airborne transmission, especially in enclosed spaces with inadequate ventilation.

The update to the agency Web page explaining how the virus spreads represents an official acknowledgment of growing evidence that under certain conditions, people farther than six feet apart can become infected by tiny droplets and particles that float in the air for minutes and hours.

Here are some significant developments:

  • Trump said he will return to the White House on Monday night after spending the past three days at Walter Reed National Military Medical Center in Bethesda, where he has been receiving treatment for covid-19.
  • White House press secretary Kayleigh McEnany said in a statement that she has tested positive.
  • Concern for White House and residence staff members has started to rise as their workplace has become a virus hot spot.
  • More attendees at a Sept. 26 Rose Garden ceremony — which is now drawing scrutiny as a possible superspreader event — tested positive over the weekend.
  • The $4 trillion bailout relief packages distributed money to those with little need for it while allowing the illness, which is now more widespread than when the bills passed, to outstrip the aid.
  • Several states in the once hard-hit Northeast were among those posting their largest new-case counts in months. But many of the sharpest increases per capita came in the Midwest and Mountain West, including Wisconsin, Iowa, Utah and the Dakotas.
  • At least 209,000 people in the United States have died of the coronavirus, according to data tracked by The Washington Post, while more than 7.3 million cases have been reported.