Nearly 600 patients wait for hospital beds in Houston following surge in COVID cases

Oregon Gov. Kate Brown said Friday she is deploying up to 1,500 members of the National Guard to help hospitals throughout the state "overstretched by patients during the delta surge."

"I cannot emphasize enough the seriousness of this crisis for all Oregonians, especially those who might need emergency or intensive care," Brown said in a video message. "When our hospitals are filled with COVID-19 patients, there may not be a room for someone needing care after a car crash or a heart attack or other emergency situation."

As of Friday morning, there were 733 people hospitalized with "severe cases" of COVID-19, including 185 patients in the intensive care unit, Brown said.

The Oregon Health Authority and the Oregon Department of Human Services are also working to provide support to hospitals, and Brown said she is requesting FEMA support.

In the meantime, the governor urged people to wear a mask while in public and get vaccinated if they haven't yet.

The American College of Physicians said Friday that masks should be required in all schools "as part of a comprehensive effort to reduce the spread of COVID-19."

The statement follows similar recommendations from the American Association of Pediatrics and the Centers for Disease Control and Prevention, and comes as some school districts have been defying bans on masks mandates in states including Texas and Florida.

"Masks are a key public health tool in keeping everyone in our school communities safe," ACP President Dr. George Abraham said in a statement. “Especially with such a large segment of our schools’ populations unable to yet access COVID-19 vaccines, masks remain a necessity in our fight to control the COVID-19 pandemic."

The ACP is the largest medical specialty society in the U.S., with over 161,000 internal medicine members.

The Centers for Disease Control and Prevention's advisory panel voted unanimously Friday to recommend an additional dose of Pfizer or Moderna for immunocompromised people. (This recommendation applies only to people who already had an initial series of mRNA -- it does not apply to people who received J&J.)

Immunocompromised people will not need a doctor's note, prescription or proof of their condition to get their third dose, CDC officials said at Friday's meeting.

"This is a self-attesting. We do not anticipate -- we are not recommending that either prescriptions or a physician sign off, or be necessary for individuals to receive an additional dose of mRNA if they're immunocompromised," said Dr. Kathleen Dooling, Medical Officer for the Division of Viral Diseases, the National Center for Immunization and Respiratory Diseases, and the CDC.

CDC Director Rochelle Walensky signed off on the recommendation later on Friday.

-ABC News' Cheyenne Haslett, Sasha Pezenik

Mississippi Gov. Tate Reeves said Friday that the state's request for a military hospital ship has been denied by the federal government.

Reeves said the request for a ship "was as much about the over 500 personnel that come with it as it was the actual physical facilities." 

"I don't anticipate that the USS Comfort is going to come to Mississippi, although we would welcome any of the 550 health care professionals that are on that particular facility that the federal government would like to send us," he said.

-ABC News' Will McDuffie