“Our shields are worn. Our resolve is being tested.”

So say the most immediate, frontline health care workers in a new ad campaign as the coronavirus pandemic rages across the United States, breaking records nearly every day for deaths — and cases — in state after state.

The campaign, in print and video, by about 100 of the nation’s largest and best-known hospital groups begins Thursday, and aims to counter public resistance to wearing masks.

The message beseeches Americans to protect everyone, including those on the forefront of the battleground in so many states where incoming patients are waiting for beds in overwhelmed hospitals with staff members fatigued from the unrelenting march of death during the pandemic.

In addition, the American Hospital Association joined with the American Nurses Association and the American Medical Association, which represents many of the nation’s doctors, urging the public to be careful in celebrating the upcoming Thanksgiving holiday.